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North Carolina Science Essential Standards Resource Pack 2.L.2: Organisms – Parents & Offspring Essential Standard: 2.L.2 Remember that organisms differ from or are similar to their parents based on the characteristics of the organism. Clarifying Objectives: 2.L.2.1 Identify ways in which plants and animals closely resemble their parents in observed appearance and ways they are different. 2.L.2.2 Recognize that there is variation among individuals that are related. Vertical Strand Maps: http://scnces.ncdpi.wikispaces.net/Strand+Maps Online Atlas map http://strandmaps.dls.ucar.edu/?id=SMS-MAP-1381 http://strandmaps.dls.ucar.edu/?id=SMS-MAP-1389 http://strandmaps.dls.ucar.edu/?id=SMS-MAP-1437 North Carolina Unpacking: http://scnces.ncdpi.wikispaces.net/Race+to+the+Top+Support+Tools Framework for K-12 Science Education: LS3: Heredity: Inheritance and Variation of Traits How are characteristics of one generation passed to the next? How can individuals of the same species and even siblings have different characteristics? Heredity explains why offspring resemble, but are not identical to, their parents and is a unifying biological principle. Heredity refers to specific mechanisms by which characteristics or traits are passed from one generation to the next via genes. Genes encode the information for making specific proteins, which are responsible for the specific traits of an individual. Each gene can have several variants, called alleles, which code for different variants of the trait in question. Genes reside in a cell’s chromosomes, each of which contains many genes. Every cell of any individual organism contains the identical set of chromosomes. When organisms reproduce, genetic information is transferred to their offspring. In species that reproduce sexually, each cell contains two variants of each chromosome, one inherited from each parent. Thus sexual reproduction gives rise to a new combination of chromosome pairs with variations between parent and offspring. Very rarely, mutations also cause variations, which may be harmful, neutral, or occasionally advantageous for an individual. Environmental as well as genetic variation and the relative dominance of each of the genes in a pair play an important role in how traits develop within an individual. Complex relationships between genes and interactions of genes with the environment determine how an organism will develop and function. LS3.A: INHERITANCE OF TRAITS How are the characteristics of one generation related to the previous generation? In all organisms, the genetic instructions for forming species’ characteristics are carried in the chromosomes. Each chromosome consists of a single very long DNA molecule, and each gene on the chromosome is a particular segment of that DNA. DNA molecules contain four different kinds of building blocks, called nucleotides, linked together in a sequential chain. The sequence of nucleotides spells out the information in a gene. Before a cell divides, the DNA sequence of its chromosomes is replicated and each daughter cell receives a copy. DNA controls the expression of proteins by being transcribed into a “messenger” RNA, which is translated in turn by the cellular machinery into a protein. In effect, proteins build an organism’s identifiable traits. When organisms reproduce, genetic information is transferred to their offspring, with half coming from each parent in sexual reproduction. Inheritance is the key factor causing the similarity among individuals in a species population. Grade Band Endpoints for LS3.A By the end of grade 2. Organisms have characteristics that can be similar or different. Young animals are very much, but not exactly, like their parents and also resemble other animals of the same kind. Plants also are very much, but not exactly, like their parents and resemble other plants of the same kind. By the end of grade 5. Many characteristics of organisms are inherited from their parents. Other characteristics result from individuals’ interactions with the environment, which can range from diet to learning. Many characteristics involve both inheritance and environment. LS3.B: VARIATION OF TRAITS Why do individuals of the same species vary in how they look, function, and behave? Variation among individuals of the same species can be explained by both genetic and environmental factors. Individuals within a species have similar but not identical genes. In sexual reproduction, variations in traits between parent and offspring arise from the particular set of chromosomes (and their respective multiple genes) inherited, with each parent contributing half of each chromosome pair. More rarely, such variations result from mutations, which are changes in the information that genes carry. Although genes control the general traits of any given organism, other parts of the DNA and external environmental factors can modify an individual’s specific development, appearance, behavior, and likelihood of producing offspring. The set of variations of genes present, together with the interactions of genes with their environment, determines the distribution of variation of traits in a population. Grade Band Endpoints for LS3.B By the end of grade 2. Individuals of the same kind of plant or animal are recognizable as similar but can also vary in many ways. By the end of grade 5. Offspring acquire a mix of traits from their biological parents. Different organisms vary in how they look and function because they have different inherited information. In each kind of organism there is variation in the traits themselves, and different kinds of organisms may have different versions of the trait. The environment also affects the traits that an organism develops—differences in where they grow or in the food they consume may cause organisms that are related to end up looking or behaving differently. Science for All Americans: HEREDITY One long-familiar observation is that offspring are very much like their parents but still show some variation: Offspring differ somewhat from their parents and from one another. Over many generations, these differences can accumulate, so organisms can be very different in appearance and behavior from their distant ancestors. For example, people have bred their domestic animals and plants to select desirable characteristics; the results are modern varieties of dogs, cats, cattle, fowl, fruits, and grains that are perceptibly different from their forebears. Changes have also been observed—in grains, for example—that are extensive enough to produce new species. In fact, some branches of descendants of the same parent species are so different from others that they can no longer breed with one another. Instructions for development are passed from parents to offspring in thousands of discrete genes, each of which is now known to be a segment of a molecule of DNA. Offspring of asexual organisms (clones) inherit all of the parent's genes. In sexual reproduction of plants and animals, a specialized cell from a female fuses with a specialized cell from a male. Each of these sex cells contains an unpredictable half of the parent's genetic information. When a particular male cell fuses with a particular female cell during fertilization, they form a cell with one complete set of paired genetic information, a combination of one half-set from each parent. As the fertilized cell multiplies to form an embryo, and eventually a seed or mature individual, the combined sets are replicated in each new cell. The sorting and combination of genes in sexual reproduction results in a great variety of gene combinations in the offspring of two parents. There are millions of different possible combinations of genes in the half apportioned into each separate sex cell, and there are also millions of possible combinations of each of those particular female and male sex cells. However, new mixes of genes are not the only source of variation in the characteristics of organisms. Although genetic instructions may be passed down virtually unchanged for many thousands of generations, occasionally some of the information in a cell's DNA is altered. Deletions, insertions, or substitutions of DNA segments may occur spontaneously through random errors in copying, or may be induced by chemicals or radiation. If a mutated gene is in an organism's sex cell, copies of it may be passed down to offspring, becoming part of all their cells and perhaps giving the offspring new or modified characteristics. Some of these changed characteristics may turn out to increase the ability of the organisms that have it to thrive and reproduce, some may reduce that ability, and some may have no appreciable effect. EVOLUTION OF LIFE The earth's present-day life forms appear to have evolved from common ancestors reaching back to the simplest one-cell organisms almost four billion years ago. Modern ideas of evolution provide a scientific explanation for three main sets of observable facts about life on earth: the enormous number of different life forms we see about us, the systematic similarities in anatomy and molecular chemistry we see within that diversity, and the sequence of changes in fossils found in successive layers of rock that have been formed over more than a billion years. Since the beginning of the fossil record, many new life forms have appeared, and most old forms have disappeared. The many traceable sequences of changing anatomical forms, inferred from ages of rock layers, convince scientists that the accumulation of differences from one generation to the next has led eventually to species as different from one another as bacteria are from elephants. The molecular evidence substantiates the anatomical evidence from fossils and provides additional detail about the sequence in which various lines of descent branched off from one another. Although details of the history of life on earth are still being pieced together from the combined geological, anatomical, and molecular evidence, the main features of that history are generally agreed upon. At the very beginning, simple molecules may have formed complex molecules that eventually formed into cells capable of self-replication. Life on earth has existed for three billion years. Prior to that, simple molecules may have formed complex organic molecules that eventually formed into cells capable of self-replication. During the first two billion years of life, only microorganisms existed—some of them apparently quite similar to bacteria and algae that exist today. With the development of cells with nuclei about a billion years ago, there was a great increase in the rate of evolution of increasingly complex, multicelled organisms. The rate of evolution of new species has been uneven since then, perhaps reflecting the varying rates of change in the physical environment. A central concept of the theory of evolution is natural selection, which arises from three well-established observations: (1) There is some variation in heritable characteristics within every species of organism, (2) some of these characteristics will give individuals an advantage over others in surviving to maturity and reproducing, and (3) those individuals will be likely to have more offspring, which will themselves be more likely than others to survive and reproduce. The likely result is that over successive generations, the proportion of individuals that have inherited advantage-giving characteristics will tend to increase. Selectable characteristics can include details of biochemistry, such as the molecular structure of hormones or digestive enzymes, and anatomical features that are ultimately produced in the development of the organism, such as bone size or fur length. They can also include more subtle features determined by anatomy, such as acuity of vision or pumping efficiency of the heart. By biochemical or anatomical means, selectable characteristics may also influence behavior, such as weaving a certain shape of web, preferring certain characteristics in a mate, or being disposed to care for offspring. New heritable characteristics can result from new combinations of parents' genes or from mutations of them. Except for mutation of the DNA in an organism's sex cells, the characteristics that result from occurrences during the organism's lifetime cannot be biologically passed on to the next generation. Thus, for example, changes in an individual caused by use or disuse of a structure or function, or by changes in its environment, cannot be promulgated by natural selection. By its very nature, natural selection is likely to lead to organisms with characteristics that are well adapted to survival in particular environments. Yet chance alone, especially in small populations, can result in the spread of inherited characteristics that have no inherent survival or reproductive advantage or disadvantage. Moreover, when an environment changes (in this sense, other organisms are also part of the environment), the advantage or disadvantage of characteristics can change. So natural selection does not necessarily result in long-term progress in a set direction. Evolution builds on what already exists, so the more variety that already exists, the more there can be. The continuing operation of natural selection on new characteristics and in changing environments, over and over again for millions of years, has produced a succession of diverse new species. Evolution is not a ladder in which the lower forms are all replaced by superior forms, with humans finally emerging at the top as the most advanced species. Rather, it is like a bush: Many branches emerged long ago; some of those branches have died out; some have survived with apparently little or no change over time; and some have repeatedly branched, sometimes giving rise to more complex organisms. The modern concept of evolution provides a unifying principle for understanding the history of life on earth, relationships among all living things, and the dependence of life on the physical environment. While it is still far from clear how evolution works in every detail, the concept is so well established that it provides a framework for organizing most of biological knowledge into a coherent picture. Benchmarks for Science Literacy: Building an observational base for heredity ought to be the first undertaking. Explanations can come later. The organisms children recognize are themselves, their classmates, and their pets. And that is the place to start studying heredity. However, it is important to be cautious about having children compare their own physical appearance to that of their siblings, parents, and grandparents. At the very least, the matter has to be handled with great delicacy so no one is embarrassed. Direct observations of generational similarities and differences of at least some plants and animals are essential. Learning the genetic explanation for how traits are passed on from one generation to the next can begin in the middle years and carry into high school. The part played by DNA in the story should wait until students understand molecules. The interaction between heredity and environment in determining plant and animal behavior will be of interest to students. Examining specific cases can help them grasp the complex interactions of genetics and environment. K-2 Teachers should lead students to make observations about how the offspring of familiar animals compare to one another and to their parents. Children know that animals reproduce their own kind—rabbits have rabbits (but you can usually tell one baby rabbit from another), cats have kittens that have different markings (but cats never have puppies), and so forth. This idea should be strengthened by a large number of examples, both plant and animal, that the children can draw on. By the end of the 2nd grade, students should know that There is variation among individuals of one kind within a population. 5B/P1 Offspring are very much, but not exactly, like their parents and like one another. 5B/P2 3-5 Students should move from describing individuals directly (she has blue eyes) to naming traits and classifying individuals with respect to those traits (eye color: blue). Students can be encouraged to keep lists of things that animals and plants get from their parents, things that they don't get, and things that the students are not sure about either way. This is also the time to start building the notion of a population whose members are alike in many ways but show some variation. By the end of the 5th grade, students should know that Some likenesses between children and parents are inherited. Other likenesses are learned. 5B/E1* For offspring to resemble their parents, there must be a reliable way to transfer information from one generation to the next. 5B/E2 Big Ideas: Essential Questions: In what ways do offspring resemble their parents? …in what ways do they differ? Do offspring always resemble one another? Enduring Understandings: Students will understand that Offspring are similar to, and different than their parents and siblings. Physical traits are inherited from parents. Characteristics are passed from parent to offspring. Each parent contributes to the offspring. Siblings can resemble one another, or they can be very different. Identify Misconceptions: Formative Assessment Probe Guide http://scnces.ncdpi.wikispaces.net/Formative+Assessment+Probe+Alignment Common Misconceptions http://wiki.nb27.org/science/1stOrganisms/first/organisms/docs/1stPlantsAnimalsMiscon.pdf http://www.neisd.net/curriculum/SchImprov/sci/program/misconceptions_inter.htm#lifecycle Annotated TEACHING Resources: NCES 2nd Grade Parents and Offspring http://www.livebinders.com/play/play?id=1641233 NCES 2nd Grade Science Livebinder http://www.livebinders.com/play/play?id=478563 Organisms and offspring unit This unit was authored by a team of educators. The template provided one example of unit design that enabled teacher-authors to organize possible learning experiences, resources, differentiation, and assessments. The unit is intended to support teachers, schools, and districts as they make their own local decisions around the best instructional plans and practices for all students. https://www.cde.state.co.us/standardsandinstruction/sc1-organismsandoffspring-pdf Cscope Investigating Animals unit Students will observe and explore ways that young animals often resemble their parents through coloration, body structure, and behavior. http://www.bigspringisd.net/Uploads/177/misc/f266812.pdf STEM Module – Parents and Offspring This is a module focused on the inheritance of traits. http://www.harmonydc.org/Curriculum/pdf/1sample.pdf Parents and offspring unit How are plants and animals like their parents? Powerpoint in pdf. http://web.compton.k12.ca.us/pages/departments/curriculum/pdf/2ndgradesciunitb.pdf Are You my Parents? Unit These lesson activities allow students to explore the life cycles of various animals and how the offspring resemble their parents and each other. They include the investigation of traits, both physical and behavioral, that affect an organism’s ability to survive and reproduce. http://www.ccsoh.us/Downloads/3LS123C%20AreYouMyParents.pdf Video Resources: Baby animal songs https://www.youtube.com/watch?v=cJg4YFtvOp8 https://www.youtube.com/watch?v=ZPzRyto8ryU Text Resources: http://www.alphabet-soup.net/farm/animalbookmain.html https://www.lernerbooks.com/SiteCollectionDocuments/TeachingGuides/9780822556589.pdf Word Walls: https://www.google.com/search?q=parents+and+offspring+word+walls&biw=1390&bih=1105&source =lnms&tbm=isch&sa=X&ved=0ahUKEwiT9Jn9t7nOAhVFyyYKHTltCQMQ_AUIBigB&dpr=0.8#tbm=isch&q =animal+parents+and+babies+wordwalls Pictures: https://www.google.com/search?q=parents+and+offspring+word+walls&biw=1390&bih=1105&source =lnms&tbm=isch&sa=X&ved=0ahUKEwiT9Jn9t7nOAhVFyyYKHTltCQMQ_AUIBigB&dpr=0.8#tbm=isch&q =animal+parents+and+babies http://www.boredpanda.com/cute-animal-parenting/ Writing Prompts: 1. Imagine that you have an identical twin. What would be some advantages and disadvantages of having an identical twin? 2. Look at a series of family pictures with parents and children. Describe how the children are similar to their parents and similar to one another. 3. Create a picture book that includes the names of animal parents and their offspring. 4. Investigate a species of bird. Write a summary of how this bird and their offspring are similar and different as the baby bird grows and develops. 5. Write an essay about two very different types of dogs. Explain how they can both be dogs, yet still be very, very different.