Sexual selection promotes hybridization between Pecos pupfish
... For each male, coloration intensity was scored for the dorsal fin, caudal fin, and dorsum on a scale from 0 to 6 (0 ¼ coloration absent, 6 ¼ peak coloration) before and after each trial. The summed pre- and post-trial scores were averaged for each male. Female C. pecosensis were exposed to male C. p ...
... For each male, coloration intensity was scored for the dorsal fin, caudal fin, and dorsum on a scale from 0 to 6 (0 ¼ coloration absent, 6 ¼ peak coloration) before and after each trial. The summed pre- and post-trial scores were averaged for each male. Female C. pecosensis were exposed to male C. p ...
intraspecific variation in sexual isolation in the
... of the two-hour assay reconfirms the large difference in interspecific sexual isolation between these strains. Mating frequencies when NV Idaho males are crossed to NL Idaho and NL California females are 57.0% and 2.6%, respectively (Table 4). We also analyzed the data to look for evidence of incipi ...
... of the two-hour assay reconfirms the large difference in interspecific sexual isolation between these strains. Mating frequencies when NV Idaho males are crossed to NL Idaho and NL California females are 57.0% and 2.6%, respectively (Table 4). We also analyzed the data to look for evidence of incipi ...
Slide 1
... within the baby’s ovaries begin to develop into cells called primary oocytes. • Meiosis stops at that point until the female reaches to sexual maturity. Then, once a month in women, one of these primary oocytes finishes meiosis and develops into ...
... within the baby’s ovaries begin to develop into cells called primary oocytes. • Meiosis stops at that point until the female reaches to sexual maturity. Then, once a month in women, one of these primary oocytes finishes meiosis and develops into ...
Crab-eating Raccoon
... behavioural patterns as members of the same genus (Chapman and Feldhamer, 1983). They are nocturnal and although they are colour blind they have good night vision. Its tactile senses set this species apart from other carnivores. Procyon cancrivorus are terrestrial but can climb well. Male raccoons a ...
... behavioural patterns as members of the same genus (Chapman and Feldhamer, 1983). They are nocturnal and although they are colour blind they have good night vision. Its tactile senses set this species apart from other carnivores. Procyon cancrivorus are terrestrial but can climb well. Male raccoons a ...
The Origin of Man Author(s): C. Owen Lovejoy Source: Science
... of parental investment. The two sides of this hypothetical balance are physiologically interdependent; as longevity is increased, each of the developmental stages is proportionately prolonged. The relationships between these variables, in fact, are not exactly linear, but they do have remarkably hig ...
... of parental investment. The two sides of this hypothetical balance are physiologically interdependent; as longevity is increased, each of the developmental stages is proportionately prolonged. The relationships between these variables, in fact, are not exactly linear, but they do have remarkably hig ...
biology - westminster.org.uk
... decreased from about 17 years to about 12 years of age. It has been suggested that a change to a higher fat diet is largely responsible for this decrease. With reference to the data in Fig. 4.1, evaluate the evidence that changes in diet may be responsible for this decrease in the age of onset of pu ...
... decreased from about 17 years to about 12 years of age. It has been suggested that a change to a higher fat diet is largely responsible for this decrease. With reference to the data in Fig. 4.1, evaluate the evidence that changes in diet may be responsible for this decrease in the age of onset of pu ...
Document
... • Rate-of-Living Theory – Senescence is caused by accumulation of irreparable damage to cells and tissues – Damage caused by errors during replication, transcription, and translation, and by accumulation of poisonous metabolic by products – All organisms have been selected to resist and repair damag ...
... • Rate-of-Living Theory – Senescence is caused by accumulation of irreparable damage to cells and tissues – Damage caused by errors during replication, transcription, and translation, and by accumulation of poisonous metabolic by products – All organisms have been selected to resist and repair damag ...
Name
... seminal fluid which contains microscopic packets of sperm, called spermatophores, to the female. Each spermatophore packet contains several thousand sperm cells. Copulation will last from 5 to 12 hours. Males have two pairs of pleopods, located towards the front of the abdomen. Both function in the ...
... seminal fluid which contains microscopic packets of sperm, called spermatophores, to the female. Each spermatophore packet contains several thousand sperm cells. Copulation will last from 5 to 12 hours. Males have two pairs of pleopods, located towards the front of the abdomen. Both function in the ...
Sexual-Selection Models for Exaggerated Traits
... each sex engages the same sex of the other pair (Barlow, 1991). As predicted, larger males were better at holding a breeding territory. The more aggressive males were the most active in defending their offspring. Thus, it pays a female to pick a large, aggressive male. This outcome is consistent wit ...
... each sex engages the same sex of the other pair (Barlow, 1991). As predicted, larger males were better at holding a breeding territory. The more aggressive males were the most active in defending their offspring. Thus, it pays a female to pick a large, aggressive male. This outcome is consistent wit ...
Concept 8.3
... Genetic mapping (quantitative trait locus analysis, or QTL) also showed that entrance tunnel length was controlled by three genetic loci. Although few studies have identified the genes, many behaviors are known to be heritable, and most are influenced by multiple genes. ...
... Genetic mapping (quantitative trait locus analysis, or QTL) also showed that entrance tunnel length was controlled by three genetic loci. Although few studies have identified the genes, many behaviors are known to be heritable, and most are influenced by multiple genes. ...
Name: Date: Period: ______ Homework: Punnett Squares
... 7. In certain birds, green feathers (G) are dominant to yellow feathers (g), and long beaks (L) are dominant to short beaks (l). Two birds that are heterozygous for both traits produce offspring. a. What percentage of offspring will have genotype GGLL? ___________ b. How many different combinations ...
... 7. In certain birds, green feathers (G) are dominant to yellow feathers (g), and long beaks (L) are dominant to short beaks (l). Two birds that are heterozygous for both traits produce offspring. a. What percentage of offspring will have genotype GGLL? ___________ b. How many different combinations ...
Zoology Exercise #10: Phylum Nematoda Lab Guide All animals
... 2. Discuss at least 3 unique attributes pertaining to the Genus Ascaris. 3. Discuss how common these parasites are in the United States, who they tend to infect, and how they manifest themselves in those infected. ...
... 2. Discuss at least 3 unique attributes pertaining to the Genus Ascaris. 3. Discuss how common these parasites are in the United States, who they tend to infect, and how they manifest themselves in those infected. ...
Sexual Selection - The American Biology Teacher
... The activities described below simulate mate choice and mate competitions, and allow testing hypotheses related to evolution by sexual selection (Figure 1). To use these activities to promote inquiry-based learning about evolution, we suggest a walk in a natural area or in a natural history museum w ...
... The activities described below simulate mate choice and mate competitions, and allow testing hypotheses related to evolution by sexual selection (Figure 1). To use these activities to promote inquiry-based learning about evolution, we suggest a walk in a natural area or in a natural history museum w ...
Concept 8.1
... their male offspring will be attractive to the next generation of females, which supports the sexy son hypothesis. But, eyestalk length in male flies is correlated with overall health and vigor (David et al.1998), supporting the ...
... their male offspring will be attractive to the next generation of females, which supports the sexy son hypothesis. But, eyestalk length in male flies is correlated with overall health and vigor (David et al.1998), supporting the ...
The Chinese Crocodile Lizard
... The donation of three wild-caught females and one male allowed me the opportunity to breed this fascinating lizard. In the years following my first acquisition, information on natural history and reports of occasionally successful breeding became available, spurring a more holistic approach to the ...
... The donation of three wild-caught females and one male allowed me the opportunity to breed this fascinating lizard. In the years following my first acquisition, information on natural history and reports of occasionally successful breeding became available, spurring a more holistic approach to the ...
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 ...
Intrapopulation variation in life history traits of Boa constrictor
... larger size in females; and geographic distribution (and hence, by inference, reproductive frequency) is correlated with sexual size dimorphism, but this correlation may be due to phylogenetic conservatism rather than to a causal relationship. Male-male combat favors the evolution of large body size ...
... larger size in females; and geographic distribution (and hence, by inference, reproductive frequency) is correlated with sexual size dimorphism, but this correlation may be due to phylogenetic conservatism rather than to a causal relationship. Male-male combat favors the evolution of large body size ...
Chicks, Hawks, and Patriarchal Institutions: Nancy Folbre
... societies, men enjoy greater sexual freedom and less responsibility for the care of dependents than women. The emergence of these asymmetric rights and responsibilities through the institutionalization of marriage rules predates the emergence of rights to private property in livestock or land. A fem ...
... societies, men enjoy greater sexual freedom and less responsibility for the care of dependents than women. The emergence of these asymmetric rights and responsibilities through the institutionalization of marriage rules predates the emergence of rights to private property in livestock or land. A fem ...
Laboratory 6 nematodes
... Juvenile nematodes are transported via the lymph or blood to all parts of the body. Further development only occurs in striated muscle, especially those muscles that are active. They penetrate individual muscle fibers, absorb nutrients from the muscle cell, and increase in length to about 1.0 mm in ...
... Juvenile nematodes are transported via the lymph or blood to all parts of the body. Further development only occurs in striated muscle, especially those muscles that are active. They penetrate individual muscle fibers, absorb nutrients from the muscle cell, and increase in length to about 1.0 mm in ...
Word - Understanding Evolution
... do you think the authors might mean by “intrinsic rate of increase”? Did they actually measure intrinsic rate of increase and number of grandchildren produced? “We found that females mated to attractive males incur a substantial survival cost. However, these costs are cancelled out and may be outwei ...
... do you think the authors might mean by “intrinsic rate of increase”? Did they actually measure intrinsic rate of increase and number of grandchildren produced? “We found that females mated to attractive males incur a substantial survival cost. However, these costs are cancelled out and may be outwei ...
Evolution of human bahavior
... chick may adopt an orphan (presumably without any penguin cultural pressures to do so). ...
... chick may adopt an orphan (presumably without any penguin cultural pressures to do so). ...
Chapter 31
... • After a sperm cell is manufactured within the testis, it is delivered to a long, coiled tube called the epididymis. • The sperm cell is not motile when it first arrives at the epididymis and must remain there for at least 18 hours before motility develops. • From the epididymis, the sperm is deliv ...
... • After a sperm cell is manufactured within the testis, it is delivered to a long, coiled tube called the epididymis. • The sperm cell is not motile when it first arrives at the epididymis and must remain there for at least 18 hours before motility develops. • From the epididymis, the sperm is deliv ...