Question

Most populations are expected to exhibit a long-term 1:1 sex ratio because eggs always have a 50% chance of being fertilized by an X-bearing sperm and a 50% chance of being fertilized by an Y-bearing sperm. this is the sex ratio that allows the population to grow at its maximal rate. once one sex becomes scarce, there will then be a fitness advantage to a parent that produces more of the rarer sex and the population eventually stabilizes at 1:1. each zygote must be formed by the union of one egg and one sperm, and the representation of males and females remains constant across generations.

          Most populations are expected to exhibit a long-term 1:1 sex ratio because

eggs always have a 50% chance of being fertilized by an X-bearing sperm and a 50% chance of being fertilized by an Y-bearing sperm.

this is the sex ratio that allows the population to grow at its maximal rate.

once one sex becomes scarce, there will then be a fitness advantage to a parent that produces more of the rarer sex and the population eventually stabilizes at 1:1.

each zygote must be formed by the union of one egg and one sperm, and the representation of males and females remains constant across generations.

Most populations are expected to exhibit a long-term 1:1 sex ratio because

eggs always have a 50% chance of being fertilized by an X-bearing sperm and a 50% chance of being fertilized by an Y-bearing sperm.

this is the sex ratio that allows the population to grow at its maximal rate.

once one sex becomes scarce, there will then be a fitness advantage to a parent that produces more of the rarer sex and the population eventually stabilizes at 1:1.

each zygote must be formed by the union of one egg and one sperm, and the representation of males and females remains constant across generations.

Added by Ivan P.

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