Homework Answers
1.sperm competition:It is competition between sperms to fertilise single ovum .sperms maybe ejaculated from two or more rivalry species to fertilise a female within a short period of time.
Significance:To increase male chances of reproductive sucesss.
2.sperm removal ,it is a competition avoidance mechanism in which stored sperms are removed from spermatheca.ex Euborellia plebeja.
3.Have more chance of meeting with ovum ,it's nutritional availability so that it can meet early with ovum.
4.cryptic female choice is a form of sexual selection as a pattern of non random post copulatory success among males caused by females.
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1. What is "sperm competition"? What is its significance? 2. Describe what "sperm removal" is, and...
QUESTION 4 In the context of sexual selection theory, what is the most likely cause of...
QUESTION 4 In the context of sexual selection theory, what is the most likely cause of the results shown on this graph? 500 Natural parent Stepparent Victims per million child years of "parent child co residence 400 -11 -14 15-17 H H Age of child A. This is the outcome of intrasexual sexual selection (male competition), specifically infanticide H -111-11- Age of child O B. This is the outcome of intersexual sexual selection (female choice), specifically the good genes hypothesis...
Can someone who is good with primates help me answer these questions? 1. Male primates commit...
Can someone who is good with primates help me answer these questions? 1. Male primates commit infanticide in one-male, multifemale groups because they want to limit the number of males in their group. females without nursing infants resume sexual receptivity. females do not want infants sired by a nonalpha male. it enhances male attractiveness to females. 2. Which of the following statements is true? Patterns of courtship, mate choice, and parental care vary greatly within the primate order. The reproductive...
1) Sexual selection usually acts more strongly on males, i.e., males compete with other males for...
1) Sexual selection usually acts more strongly on males, i.e., males compete with other males for access to females, and females choose among potential male mates. Give one specific example of role-reversed mate choice (the male chooses among females) (1). What kinds of female traits do males base their choice on (1)? What types of benefits do males receive (1)? How does this differ from female mate choice (2)? Please help!
Question 1 1 pts All of the following provide data for testing evolution, EXCEPT: fossil record...
Question 1 1 pts All of the following provide data for testing evolution, EXCEPT: fossil record embryology philosophy molecular biology morphology Flag this Question Question 2 1 pts Which of the following terms is NOT a domain in the phylogenetic Tree of Life? Opisthokonta Bacteria Archaea Eukaryota Flag this Question Question 3 1 pts Which statement about the human chromosomal make-up (genome) is TRUE? Human chromosomes are most homologous to orangatans. Human chromosomes are most homologous to chimpanzees. Human chromosomes...
ON MULTIPLE CHOICE, CIRCLE LETTER OF ALL CORRECT ANSWERS!!! 31. (2 pts) True or False. Sexual...
ON MULTIPLE CHOICE, CIRCLE LETTER OF ALL CORRECT ANSWERS!!! 31. (2 pts) True or False. Sexual dimorphism is the phenomenon that caused biologists to focus on sexual selection. 32. ( pts) What is the most important basic underlying difference between the sexes that causes sexual selection to usually operate differently in males than in females? A. The cost of reproduction is usually higher in females. B. The cost of reproduction is usually higher in males. C. Males have only 1...
please help me with these questions. i cant post anymore and im studying for my exam....
please help me with these questions. i cant post anymore and
im studying for my exam. thank you in advance
A flock of birds which are blown of course and end up on an unpopulated island could be an example of: Vicariant Speciation a Founder Event A Bottleneck Natural Selection Which of the following is NOT one of the five theories of Darwinism (Mayr)? Survival of the fittest Gradualism Common descent Perpetual Change Multiplication of species Which of the following...
1. What is often true about the relative rates of phenotypic evolution of sexually selected traits vs most other kinds of traits? 2. In the good genes model, why does a male trait have to be costly i...
1. What is often true about the relative rates of phenotypic evolution of sexually selected traits vs most other kinds of traits? 2. In the good genes model, why does a male trait have to be costly in order for the female preference to be maintained by natural selection? 3. Explain the Fisherian (runaway)model of sexual selection –what generates correlations between female preferences and male traits. What kind of experimental observation would support the model? 4. Explain the concept of...
According to Robert Trivers, why are men generally larger and more physically aggressive than women? Because...
According to Robert Trivers, why are men generally larger and more physically aggressive than women? Because women are more reproductively “valuable” than men, hence competition for mates is fiercer among men Because men invest more heavily in reproduction than women Because men secrete more testosterone Trivers’ theory does not speculate on the origin of the sex difference in size and physical aggression Although some women are interested in casual sex (short-term mating), research has suggested that there are differences in...
NTRODUCTION Under nearly all circumstances, postzygotic reproductive isolation cannot evolve under the direct action of natural...
NTRODUCTION
Under nearly all circumstances, postzygotic reproductive
isolation cannot evolve under the direct action of natural
selection. Instead, postzygotic isolation evolves as a by-product
of other genetic changes as proto-species diverge. In contrast,
natural selection can directly act to enhance prezygotic
reproductive isolation. Consider two species with overlapping
ranges. If hybrids between the species are less fit than pure
species individuals, females that mated with heterospecific males
would be at a selective disadvantage, because their resulting
offspring had low fitness....
need help with this .. From the pages 571-587 attached below. 1a) Suppose a population of...
need help with this ..
From the pages 571-587 attached below.
1a) Suppose a population of guppies was infected with a
parasite. In that population a mutation results in a parasite
resistant genotype that spreads through the population through
natural selection. A subsequent mutation in the parasite results in
a genotype that is unaffected by the newly evolved resistant guppy
genotype. What is the name of the hypothesis that explains this
host parasite “arms race”.?
1b) What is this name...
QUESTION 4 In the context of sexual selection theory, what is the most likely cause of the results shown on this graph? 500 Natural parent Stepparent Victims per million child years of "parent child co residence 400 -11 -14 15-17 H H Age of child A. This is the outcome of intrasexual sexual selection (male competition), specifically infanticide H -111-11- Age of child O B. This is the outcome of intersexual sexual selection (female choice), specifically the good genes hypothesis...
ON MULTIPLE CHOICE, CIRCLE LETTER OF ALL CORRECT ANSWERS!!! 31. (2 pts) True or False. Sexual dimorphism is the phenomenon that caused biologists to focus on sexual selection. 32. ( pts) What is the most important basic underlying difference between the sexes that causes sexual selection to usually operate differently in males than in females? A. The cost of reproduction is usually higher in females. B. The cost of reproduction is usually higher in males. C. Males have only 1...
please help me with these questions. i cant post anymore and
im studying for my exam. thank you in advance
A flock of birds which are blown of course and end up on an unpopulated island could be an example of: Vicariant Speciation a Founder Event A Bottleneck Natural Selection Which of the following is NOT one of the five theories of Darwinism (Mayr)? Survival of the fittest Gradualism Common descent Perpetual Change Multiplication of species Which of the following...
NTRODUCTION
Under nearly all circumstances, postzygotic reproductive
isolation cannot evolve under the direct action of natural
selection. Instead, postzygotic isolation evolves as a by-product
of other genetic changes as proto-species diverge. In contrast,
natural selection can directly act to enhance prezygotic
reproductive isolation. Consider two species with overlapping
ranges. If hybrids between the species are less fit than pure
species individuals, females that mated with heterospecific males
would be at a selective disadvantage, because their resulting
offspring had low fitness....
need help with this ..
From the pages 571-587 attached below.
1a) Suppose a population of guppies was infected with a
parasite. In that population a mutation results in a parasite
resistant genotype that spreads through the population through
natural selection. A subsequent mutation in the parasite results in
a genotype that is unaffected by the newly evolved resistant guppy
genotype. What is the name of the hypothesis that explains this
host parasite “arms race”.?
1b) What is this name...
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