4. For some species, sex determination is not genetic, but environmental. In fact, some species can change their sex in response to changing environmental conditions to maximize their fitness. Consider a species capable of changing their sex. What might you expect from this species, given the relationship selection graph illustrated below? male Fitness female Frequency of Males
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Sex determination is best described as: The way genes are expressed as an individual develops into a male or a female. The outward phenotype of an individuals' genitals. Differences in the genome between male and female individuals of the same species. The mechanism by which an individual develops into a male or a female.
Madhur L.
Most animal populations have a 50: 50 ratio of males to females. This does not have to be so; it is theoretically possible for parents to produce predominantly male offspring or predominantly female offspring. Imagine a population with a male-biased sex ratio, say, $70 \%$ males and $30 \%$ females. Which sex will have an easier time finding a mate? As a result, which sex will probably have higher average fitness? Which parents will have higher fitness- those that produce mostly males or those that produce mostly females? Now imagine the same population with a female-biased sex ratio, and answer the same questions. What sort of selection is probably maintaining the 50: 50 sex ratio seen in most populations?
Sexual selection is a type of natural selection that favors individuals with traits that increase their ability to obtain mates, such as female choice for bright orange beaks in zebra finches. Propose a scenario where sexual selection could contribute to divergence in sympatric speciation.
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