4. Consider these data obtained from a freshwater fish species.
a) According to these data, which sex experiences more limitation to their reproductive success due to availability of mates? Explain how you are interpreting the graph.
b) Which sex would you expect to be more discriminating regarding mates (who does the choosing)? Explain.
Homework Answers
a) Females expeiences more limitation to their reproductive success due to unavailability of mates. For many females availability of mate is very low. For about 55 of females availability of mate is restricted even less than 1 in one species. same in the case of other species . female to mate ratio is larger than male to mate ratio. Males are capable of producing more ,even millions of sperms. males have greater reproductive variance.
b) Males have more discriminating regarding mates because males provide higher mating success compared to females
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4. Consider these data obtained from a
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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....
How Does Evolutionary Change Occur? "I soon perceived that selection was the keystone of man's success...
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1-There is a population of individuals which are geographically isolated from other populations of their species....
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Their population mates randomly, has no net mutations in their
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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...
6 6) You observe a species of wasp that has the following distribution of lifetime reproductive success for males and females in a population. Would you expect the males or the females to have evolved to be more selective in choosing a mate based on the data? Explain your answer. (4 points) 0 n 25 o 20 O 15 ち10 ■ Females Males 0 10 20 30 40 50 60 70 80 Total number of offspring
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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....
How Does Evolutionary Change Occur? "I soon perceived that selection was the keystone of man's success in making useful races of animals and plants. But how selection could be applied to organisms living in a state of nature remained for some time a mystery to me." - Charles Darwin Introduction Fundamentally, evolution is the idea that the form and behaviors of a species are not fixed - that they can change over time. Before Darwin was even born, some scientists...
1-There is a population of individuals which are
geographically isolated from other populations of their species.
Their population mates randomly, has no net mutations in their
genome, and is not subjected to natural selection pressures.
However, their population is small, only 200 individuals. The gene
for fur color in this population has two alleles in a
dominant-recessive relationship, A and a. If allele A is currently
at a frequency of 0.8 and allele a is at 0.2:
i. What do...
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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