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Early Evolution of Terrestrial Vertebrates
... Paired internal nares functioned in chemoreception On land, combination would be used to draw in oxygenrich air through nares into the air-filled cavity Modified for support and movement underwater On land, would provide same function ...
... Paired internal nares functioned in chemoreception On land, combination would be used to draw in oxygenrich air through nares into the air-filled cavity Modified for support and movement underwater On land, would provide same function ...
1 Properties of Matter
... bones produce both red and white blood cells. 4.6 Recognize that the sexual reproductive system allows organisms to produce offspring that receive half of their genetic information from their mother and half from their father and that sexually produced offspring resemble, but are not identical to, e ...
... bones produce both red and white blood cells. 4.6 Recognize that the sexual reproductive system allows organisms to produce offspring that receive half of their genetic information from their mother and half from their father and that sexually produced offspring resemble, but are not identical to, e ...
Sex in an Evolutionary Perspective: Just Another Reaction Norm
... discrete classes (even when leaving aside the obvious case of hermaphroditic organisms, for instance most plants). We may recognise the sexes as categories, on the basis of morphology or—when applicable—sex chromosomes, and it is of course often useful to search for and investigate statistical diffe ...
... discrete classes (even when leaving aside the obvious case of hermaphroditic organisms, for instance most plants). We may recognise the sexes as categories, on the basis of morphology or—when applicable—sex chromosomes, and it is of course often useful to search for and investigate statistical diffe ...
TECHNOLOGIES OF DESIRE: TYPISTS
... acting as a medium between the spoken and the typewritten word’. 19 The word ‘medium’ links the typist and telegraphist with unconscious communication, and the possibility of the machine with which they work dislocating the self, or ‘I’, from the physical act of writing. Such issues construct a dich ...
... acting as a medium between the spoken and the typewritten word’. 19 The word ‘medium’ links the typist and telegraphist with unconscious communication, and the possibility of the machine with which they work dislocating the self, or ‘I’, from the physical act of writing. Such issues construct a dich ...
- the Canada Border Services Agency
... Note: Depictions and descriptions of sexual activities involving children and/or juveniles (persons under the age of 18) will generally constitute child pornography. Interpretation 3. The following represents the CBSA’s interpretation of several terms contained within its obscenity indicators. These ...
... Note: Depictions and descriptions of sexual activities involving children and/or juveniles (persons under the age of 18) will generally constitute child pornography. Interpretation 3. The following represents the CBSA’s interpretation of several terms contained within its obscenity indicators. These ...
Do you know the sex of your cells? - AJP-Cell
... “female” cells. Regardless of whether or not genes on the Y chromosome, other than SRY, are important in determining cellular function, the SRY genes certainly are. In the 45-day-old 46XY human fetus, these genes cause the gonadal ridge to develop into the testes (89). The fetal testes secrete Mulle ...
... “female” cells. Regardless of whether or not genes on the Y chromosome, other than SRY, are important in determining cellular function, the SRY genes certainly are. In the 45-day-old 46XY human fetus, these genes cause the gonadal ridge to develop into the testes (89). The fetal testes secrete Mulle ...
`sex` in advertising
... objective, as defined by Richmond and Hartman) and inappropriate (entirely subjective). The labels were generated after evaluating a number of advertisements using bi-polar scale items and then conflated into dimensions. Important to this attempt to define sex in advertising is that the definition i ...
... objective, as defined by Richmond and Hartman) and inappropriate (entirely subjective). The labels were generated after evaluating a number of advertisements using bi-polar scale items and then conflated into dimensions. Important to this attempt to define sex in advertising is that the definition i ...
Parasitology Glossary
... which two equal and similar individuals are formed e.g. amoeba (Entamoeba histolytica). Division may be transverse, e.g. ciliates (Balantidium coli) or longitudinal e.g. flagellates (Trypanosoma gambiense). It usually occurs in the free-living state but may occur in the encysted state where several ...
... which two equal and similar individuals are formed e.g. amoeba (Entamoeba histolytica). Division may be transverse, e.g. ciliates (Balantidium coli) or longitudinal e.g. flagellates (Trypanosoma gambiense). It usually occurs in the free-living state but may occur in the encysted state where several ...
omen`s Sexual ystery School
... Who we think we are is only a limited version of who we really are, which is creational energy-and our bodies the vessels through which this creational energy flows through. The more we can open beyond our personalities into the vastness of our Being, the more this sexual, creative, life force energ ...
... Who we think we are is only a limited version of who we really are, which is creational energy-and our bodies the vessels through which this creational energy flows through. The more we can open beyond our personalities into the vastness of our Being, the more this sexual, creative, life force energ ...
Selection on male size, leg length and condition
... advantage because their lower metabolic requirements enable them to spend more of their time and energy searching for females and mating (Reiss 1989; Blanckenhorn et al. 1995; Blanckenhorn 2000). However, in species where adult males do not or only rarely feed, such as in orb-weaving spiders, large ...
... advantage because their lower metabolic requirements enable them to spend more of their time and energy searching for females and mating (Reiss 1989; Blanckenhorn et al. 1995; Blanckenhorn 2000). However, in species where adult males do not or only rarely feed, such as in orb-weaving spiders, large ...
Organ systems of the worm HW 11/25
... length. The nerves transmit electrical signals from the nerve cord to various other systems, such as telling the muscles to contract or the gizzard to start grinding food. Reproductive System An earthworms needs to mate with another worm to produce eggs, but they don't have to look for a specific ge ...
... length. The nerves transmit electrical signals from the nerve cord to various other systems, such as telling the muscles to contract or the gizzard to start grinding food. Reproductive System An earthworms needs to mate with another worm to produce eggs, but they don't have to look for a specific ge ...
Organs of the Respiratory System
... Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. ...
... Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. ...
Diversity of Protists
... Occasionally reproduces sexually Gametes fuse to form a zygote Becomes a heavy-walled, resistant zygospore - Goes into a period of dormancy - Upon germination produces four zoospores by meiosis ...
... Occasionally reproduces sexually Gametes fuse to form a zygote Becomes a heavy-walled, resistant zygospore - Goes into a period of dormancy - Upon germination produces four zoospores by meiosis ...
Remember – The Caya® diaphragm does not protect against STIs
... accepts no responsibility for difficulties that may arise as a result of an individual acting on the advice and recommendations it contains. ...
... accepts no responsibility for difficulties that may arise as a result of an individual acting on the advice and recommendations it contains. ...
Do you know the sex of your cells?
... “female” cells. Regardless of whether or not genes on the Y chromosome, other than SRY, are important in determining cellular function, the SRY genes certainly are. In the 45-day-old 46XY human fetus, these genes cause the gonadal ridge to develop into the testes (89). The fetal testes secrete Mulle ...
... “female” cells. Regardless of whether or not genes on the Y chromosome, other than SRY, are important in determining cellular function, the SRY genes certainly are. In the 45-day-old 46XY human fetus, these genes cause the gonadal ridge to develop into the testes (89). The fetal testes secrete Mulle ...
Chapter 5 pages/jg - Sinauer Associates
... number of microscopic aquatic life forms (e.g., rotifers), referring to them as animalcules (little animals). For nearly 200 years, protists were classified along with a great variety of other microscopic life forms under various names (e.g., Infusoria). The name protozoon (Greek, proto, “first”; zo ...
... number of microscopic aquatic life forms (e.g., rotifers), referring to them as animalcules (little animals). For nearly 200 years, protists were classified along with a great variety of other microscopic life forms under various names (e.g., Infusoria). The name protozoon (Greek, proto, “first”; zo ...
The Great Struggles of Life: Darwin and the Emergence of
... harles Darwin may be considered the first evolutionary psychologist. At the end of On the Origin of Species, Darwin predicted, “In the distant future . . . psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation. Much light will ...
... harles Darwin may be considered the first evolutionary psychologist. At the end of On the Origin of Species, Darwin predicted, “In the distant future . . . psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation. Much light will ...
Aerial performance of stalk-eyed ¯ies that differ in eye span
... a given sex, usually males, experience a mating advantage through the mechanisms of female choice or male competition. Almost all recent theoretical models assume that elaborate male secondary sexual characteristics are costly to produce and to maintain (e.g., Grafen 1990a, b; Pomiankowski et al. 19 ...
... a given sex, usually males, experience a mating advantage through the mechanisms of female choice or male competition. Almost all recent theoretical models assume that elaborate male secondary sexual characteristics are costly to produce and to maintain (e.g., Grafen 1990a, b; Pomiankowski et al. 19 ...
paper (pdf 1.16 MB) - Australian Institute of Criminology
... The proliferation of pornographic materials and their ease of access are such that it is not a matter of whether a young person will be exposed to pornography but when. Exposure may be inadvertent (such as through unsolicited e-mails or an accidental encounter with pornography online) or intentional ...
... The proliferation of pornographic materials and their ease of access are such that it is not a matter of whether a young person will be exposed to pornography but when. Exposure may be inadvertent (such as through unsolicited e-mails or an accidental encounter with pornography online) or intentional ...
Concepts of Biology - Amazon Simple Storage Service (S3)
... Most animals have diploid body (somatic) cells and a small number of haploid reproductive (gamete) cells produced through meiosis. Some exceptions exist: For example, in bees, wasps, and ants, the male is haploid because it develops from an unfertilized egg. Most animals ...
... Most animals have diploid body (somatic) cells and a small number of haploid reproductive (gamete) cells produced through meiosis. Some exceptions exist: For example, in bees, wasps, and ants, the male is haploid because it develops from an unfertilized egg. Most animals ...
Relieve vaginal dryness
... Vaginal dryness (atrophy) is partly controlled by the feminine sex hormone oestrogen. When normal levels of oestrogen are present, the vaginal mucosa has a suitable thickness and produces mucous liquid. Dryness is a common nuisance for menopausal women, but they are not the only victims for this con ...
... Vaginal dryness (atrophy) is partly controlled by the feminine sex hormone oestrogen. When normal levels of oestrogen are present, the vaginal mucosa has a suitable thickness and produces mucous liquid. Dryness is a common nuisance for menopausal women, but they are not the only victims for this con ...
Biology (SPA)
... (1635–1703), one of the first scientists to use a microscope to examine pond water, cork and other things, was the first to refer to the cavities he saw in cork as ‘cells’, Latin for chambers. Subsequent scientists developed Hooke’s discovery of the cell into the Cell Theory on which modern Biology ...
... (1635–1703), one of the first scientists to use a microscope to examine pond water, cork and other things, was the first to refer to the cavities he saw in cork as ‘cells’, Latin for chambers. Subsequent scientists developed Hooke’s discovery of the cell into the Cell Theory on which modern Biology ...
explanation - mbhsbiologystaar
... discussed the lac and trp operons in your Biology class and remembered that the genes that code for the breakdown of lactose or the synthesis of tryptophan can be turned on and off as the cell needs those things to be done. • If not, here are some other things you might have known: – Genes are on li ...
... discussed the lac and trp operons in your Biology class and remembered that the genes that code for the breakdown of lactose or the synthesis of tryptophan can be turned on and off as the cell needs those things to be done. • If not, here are some other things you might have known: – Genes are on li ...
English - SciELO Colombia
... debut- and the number of sexual partners, and taking into account that the curves distribution was normal, the t Student test was used, in which men reported an average in sexual debut at 15.7 years of age (DE=1.699) while the women’s group reported an average of 17.2 years old (DE=1.744). Therefore ...
... debut- and the number of sexual partners, and taking into account that the curves distribution was normal, the t Student test was used, in which men reported an average in sexual debut at 15.7 years of age (DE=1.699) while the women’s group reported an average of 17.2 years old (DE=1.744). Therefore ...
Chapter 24 Introduction to Animals
... mesoderm, forms between the endoderm and the ectoderm. In some animals, the mesoderm forms from cells that break away from the endoderm near the opening of the gastrula. In more highly evolved animals, the mesoderm forms from pouches of endoderm cells on the inside of the gastrula. As development co ...
... mesoderm, forms between the endoderm and the ectoderm. In some animals, the mesoderm forms from cells that break away from the endoderm near the opening of the gastrula. In more highly evolved animals, the mesoderm forms from pouches of endoderm cells on the inside of the gastrula. As development co ...
Sexual reproduction
Sexual reproduction is a form of reproduction where two morphologically distinct types of specialized reproductive cells called gametes fuse together, involving a female's large ovum (or egg) and a male's smaller sperm. Each gamete contains half the number of chromosomes of normal cells. They are created by a specialized type of cell division, which only occurs in eukaryotic cells, known as meiosis. The two gametes fuse during fertilization to produce DNA replication and the creation of a single-celled zygote which includes genetic material from both gametes. In a process called genetic recombination, genetic material (DNA) joins up so that homologous chromosome sequences are aligned with each other, and this is followed by exchange of genetic information. Two rounds of cell division then produce four daughter cells with half the number of chromosomes from each original parent cell, and the same number of chromosomes as both parents, though self-fertilization can occur. For instance, in human reproduction each human cell contains 46 chromosomes, 23 pairs, except gamete cells, which only contain 23 chromosomes, so the child will have 23 chromosomes from each parent genetically recombined into 23 pairs. Cell division initiates the development of a new individual organism in multicellular organisms, including animals and plants, for the vast majority of whom this is the primary method of reproduction. A species is defined as a taxonomic rank. A species is often defined as the largest group of organisms where two hybrids are capable of reproducing fertile offspring, typically using sexual reproduction, although the species problem encompasses a series of difficult related questions that often come up when biologists define the word species. The evolution of sexual reproduction is a major puzzle because asexual reproduction should be able to outcompete it as every young organism created can bear its own young. This implies that an asexual population has an intrinsic capacity to grow more rapidly with each generation. This 50% cost is a fitness disadvantage of sexual reproduction. The two-fold cost of sex includes this cost and the fact that any organism can only pass on 50% of its own genes to its offspring. One definite advantage of sexual reproduction is that it prevents the accumulation of genetic mutations.Sexual selection is a mode of natural selection in which some individuals out-reproduce others of a population because they are better at securing mates for sexual reproduction. It has been described as ""a powerful evolutionary force that does not exist in asexual populations""Prokaryotes reproduce through asexual reproduction but may display processes similar to sexual reproduction (mechanisms for lateral gene transfer such as bacterial conjugation, transformation and transduction), but they do not lead to reproduction. In prokaryotes, the initial cell has additional or transformed genetic material.