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Human Genetics: Test Your Understanding + ward ' s science Compare the number of chromosomes in a normal human body cell with the number of chromosomes in a normal human reproductive cell. A normal human body cell is diploid and contains 46 chromosomes, and a normal human reproductive cell is haploid and contains 23 chromosomes. If a male hemophiliac has a child with a female carrier, is there a possibility that their son will be a hemophiliac? Is there a possibility their daughter will be a hemophiliac? Explain your answer. Yes. Because the mother is a carrier, a child born in this situation has a 50% chance of receiving the mutant allele on the X chromosome. Both a son or a daughter will be a hemophiliac if he or she receives the hemophilia allele from the mother. Critical Thinking: Why are conservation biologists concerned with genetic drift? Conservation biologists often study small populations of plant or animal species. Small populations have a greater chance of genetic drift than larger populations. If too much diversity is lost through genetic drift, the population might not survive. ~ Continued ~

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