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Natural selection
... What do you think natural selection mean? (“Nature chooses”, chooses what? Best adaptations for survival) ...
... What do you think natural selection mean? (“Nature chooses”, chooses what? Best adaptations for survival) ...
Biology 121 Sec 999 F10 Practice Exam 4
... single mutation, can change into a potent cow repellent. Natural selection will: a. cause this gene to mutate more often. b. cause this gene to mutate less often. c. have no effect on the rate of mutation. ...
... single mutation, can change into a potent cow repellent. Natural selection will: a. cause this gene to mutate more often. b. cause this gene to mutate less often. c. have no effect on the rate of mutation. ...
lesson Plans - Lemon Bay High School
... Reading/discussion Powerpoint/Outline: questions: Charles Darwin Extinction and Fossil & the Theory of Evolution Formation ...
... Reading/discussion Powerpoint/Outline: questions: Charles Darwin Extinction and Fossil & the Theory of Evolution Formation ...
Evolution - Mrs. Cardoza Biology
... 2. Lamarck: • Biologist • Inheritance of acquired traits Wrong • 1st to come with an idea about how animals change ...
... 2. Lamarck: • Biologist • Inheritance of acquired traits Wrong • 1st to come with an idea about how animals change ...
Allee effect, sexual selection and demographic stochasticity
... populations. Analyses demonstrate that purely demographically stochastic effects may appear in even relatively large populations when females invest differentially in reproduction relative to the phenotype of their mate. ...
... populations. Analyses demonstrate that purely demographically stochastic effects may appear in even relatively large populations when females invest differentially in reproduction relative to the phenotype of their mate. ...
Evolution Review
... A common misconception about the theory of evolution is that humans evolved from apes. What is the real evolutionary connection between humans and apes? ...
... A common misconception about the theory of evolution is that humans evolved from apes. What is the real evolutionary connection between humans and apes? ...
b) Directional Selection
... - Microevolution is a change in relative frequency of alleles in the gene pool of a population. - A population is at genetic equilibrium if 5 conditions are met: ...
... - Microevolution is a change in relative frequency of alleles in the gene pool of a population. - A population is at genetic equilibrium if 5 conditions are met: ...
No Slide Title - Teacher Pages
... disease. Only some survive to adulthood. Successful Reproduction- The individuals that are best adapted to their environment are likely to have many offspring that survive. ...
... disease. Only some survive to adulthood. Successful Reproduction- The individuals that are best adapted to their environment are likely to have many offspring that survive. ...
CHAPTER2 - Blackwell Publishing
... sympathy. Neutral observers will say that babies look more like their fathers than their mothers at birth; this effect disappears over time. The Three Assumptions of Evolutionary Theory. Evolutionary theory has three basic assumptions, we said last time. First, the organizing force of the human bein ...
... sympathy. Neutral observers will say that babies look more like their fathers than their mothers at birth; this effect disappears over time. The Three Assumptions of Evolutionary Theory. Evolutionary theory has three basic assumptions, we said last time. First, the organizing force of the human bein ...
File
... to his thoughts about biological change? Critical Thinking: What would Lamarck had predicted about the muscle structure of a baby born from a mother and father who were professional body-builders? How does Malthus’ ideas about human population growth apply to other species like maple trees or oyster ...
... to his thoughts about biological change? Critical Thinking: What would Lamarck had predicted about the muscle structure of a baby born from a mother and father who were professional body-builders? How does Malthus’ ideas about human population growth apply to other species like maple trees or oyster ...
CPS Review of Concept 15.1
... Two lions can mate and produce fertile offspring. Two ligers can mate and produce fertile offspring. Two tigers can mate and produce fertile offspring. ...
... Two lions can mate and produce fertile offspring. Two ligers can mate and produce fertile offspring. Two tigers can mate and produce fertile offspring. ...
Evolution Summative Assessment DO NOT WRITE ON TEST
... a. Penguins live on land and feed in the water; therefore they have no need to fly. b. The Antarctic home of penguins is flat and barren; therefore there is no place to fly. c. Ancestral penguins without large wings were better able to swim and feed in the water; theref ...
... a. Penguins live on land and feed in the water; therefore they have no need to fly. b. The Antarctic home of penguins is flat and barren; therefore there is no place to fly. c. Ancestral penguins without large wings were better able to swim and feed in the water; theref ...
Natural Selection
... 1. There is genetic variation in populations 2. There is competition/a struggle for existence in nature—for food, resources, mates, etc. Invidiuals which are more fit in a specific environment have a better chance of surviving and reproducing than less fit organisms. 3. Over time, generations will c ...
... 1. There is genetic variation in populations 2. There is competition/a struggle for existence in nature—for food, resources, mates, etc. Invidiuals which are more fit in a specific environment have a better chance of surviving and reproducing than less fit organisms. 3. Over time, generations will c ...
Bio - Ch 15 - Darwin and Evolution - BOOK TEST
... b. if finches and tortoises had originated from the same ancestral species. c. if all birds on the different islands were finches. d. why all tortoises on the different islands were identical. _____ 3. Which of the following ideas is supported by Darwin’s observation of local variation among tortois ...
... b. if finches and tortoises had originated from the same ancestral species. c. if all birds on the different islands were finches. d. why all tortoises on the different islands were identical. _____ 3. Which of the following ideas is supported by Darwin’s observation of local variation among tortois ...
Sexual selection
... • Because the mutation confers an advantage, it’s known as an adaptation. • Heritable adaptations then spread through the population, increasing in frequency until potentially giving rise to an entirely new species. • Thus, the Darwinian line: Descent with modification. ...
... • Because the mutation confers an advantage, it’s known as an adaptation. • Heritable adaptations then spread through the population, increasing in frequency until potentially giving rise to an entirely new species. • Thus, the Darwinian line: Descent with modification. ...
Natural Selection
... Antibiotic resistance of bacteria Moth color (melanin) Camouflage/Mimics Many sexually selected traits ...
... Antibiotic resistance of bacteria Moth color (melanin) Camouflage/Mimics Many sexually selected traits ...
Darwin and Natural Selection
... Observation 2: Populations tend to remain relatively stable Observation 3: Resources in the environment are limited and cannot support unlimited growth Inference 1: There is a struggle for survival and reproduction – not everyone succeeds ...
... Observation 2: Populations tend to remain relatively stable Observation 3: Resources in the environment are limited and cannot support unlimited growth Inference 1: There is a struggle for survival and reproduction – not everyone succeeds ...
Historic Context
... • All of the accumulated changes that have occurred over time • Darwin’s definition: Descent with modification • Life’s history is a tree with different branches ...
... • All of the accumulated changes that have occurred over time • Darwin’s definition: Descent with modification • Life’s history is a tree with different branches ...
population thinking I: natural selection
... Selection favors individual fitness, not the good of the species. And it is blindly “situational”, not forward looking, and not progressive! (a) G. fortis on Daphne Major (b) G. fuliginosa on Los Hermanos (c) Both species on Santa Cruz ...
... Selection favors individual fitness, not the good of the species. And it is blindly “situational”, not forward looking, and not progressive! (a) G. fortis on Daphne Major (b) G. fuliginosa on Los Hermanos (c) Both species on Santa Cruz ...
Document
... • Adaptation – Different kinds of teeth for different animals, say carnivore ripping teeth and herbivore grinding teeth – Different tissues within species • Heart vs. eye etc. ...
... • Adaptation – Different kinds of teeth for different animals, say carnivore ripping teeth and herbivore grinding teeth – Different tissues within species • Heart vs. eye etc. ...
PPT
... Males that match-up to the females’ demands are selected for (tails become longer, colours become brighter etc etc). Females that select males based on a costly trait will pick the more vigorous males, and therefore have fitter offspring. Therefore there is selection on females to select costly trai ...
... Males that match-up to the females’ demands are selected for (tails become longer, colours become brighter etc etc). Females that select males based on a costly trait will pick the more vigorous males, and therefore have fitter offspring. Therefore there is selection on females to select costly trai ...
1DarwinianEvolution22_1
... evolution differed from Darwin’s. The difference between structures that are homologous and those that are analogous, and how this relates to evolution. The role of adaptations, variation, time, reproductive success, and heritability in evolution. ...
... evolution differed from Darwin’s. The difference between structures that are homologous and those that are analogous, and how this relates to evolution. The role of adaptations, variation, time, reproductive success, and heritability in evolution. ...
File - Tabb Life Science
... Selective breeding - the human practice of breeding animals or plants that have desired characteristics Natural selection - the process by which organisms that are better adapted to their environment survive and reproduce more successfully than less well adapted individuals do; a theory to explain t ...
... Selective breeding - the human practice of breeding animals or plants that have desired characteristics Natural selection - the process by which organisms that are better adapted to their environment survive and reproduce more successfully than less well adapted individuals do; a theory to explain t ...
Darwinsprinciples
... Darwin’s finches Differences in beaks allowed some finches to… successfully compete successfully feed successfully reproduce ...
... Darwin’s finches Differences in beaks allowed some finches to… successfully compete successfully feed successfully reproduce ...
Sexual selection
![](https://commons.wikimedia.org/wiki/Special:FilePath/Paon_blanc_Madère_2008.jpg?width=300)
Sexual selection is a mode of natural selection where typically members of one gender choose mates of the other gender to mate with, called intersexual selection, and where females normally do the choosing, and competition between members of the same gender to sexually reproduce with members of the opposite sex, called intrasexual selection. These two forms of selection mean that some individuals have better reproductive success than others within a population either from being sexier or preferring sexier partners to produce offspring. For instance in the breeding season sexual selection in frogs occurs with the males first gathering at the water's edge and croaking. The females then arrive and choose the males with the deepest croaks and best territories. Generalizing, males benefit from frequent mating and monopolizing access to a group of fertile females. Females have a limited number of offspring they can have and they maximize the return on the energy they invest in reproduction.First articulated by Charles Darwin who described it as driving speciation and that many organisms had evolved features whose function was deleterious to their individual survival, and then developed by Ronald Fisher in the early 20th century. Sexual selection can lead typically males to extreme efforts to demonstrate their fitness to be chosen by females, producing secondary sexual characteristics, such as ornate bird tails like the peacock plumage, or the antlers of deer, or the manes of lions, caused by a positive feedback mechanism known as a Fisherian runaway, where the passing on of the desire for a trait in one sex is as important as having the trait in the other sex in producing the runaway effect. Although the sexy son hypothesis indicates that females would prefer male sons, Fisher's principle explains why the sex ratio is 1:1 almost without exception. Sexual selection is also found in plants and fungi.The maintenance of sexual reproduction in a highly competitive world has long been one of the major mysteries of biology given that asexual reproduction can reproduce much more quickly as 50% of offspring are not males, unable to produce offspring themselves. However, research published in 2015 indicates that sexual selection can explain the persistence of sexual reproduction.