Suppose Dr. Barnes is a fertility specialist who studies the sex of recently fertilized ova. If her research population included all fertilized ova conceived in a population, and if she found that 1,000 of these zygotes were female, she should expect that the population would also include _____ male zygotes.

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Quizplus · Accepted Answer

There are about 125 male conceptions for every 100 females conceived. It should be noted, however, that at birth this ratio falls to about 105 to 100. These data reflect both the greater likelihood of the sperm containing the smaller Y chromosome to fertilize the egg and the greater vulnerability of the male during the prenatal period