Multiple Choice 1. At the chromosomal level, what is the difference between human males and human females? (1 point)
All males have a Y chromosome, and females do not. All males have an X chromosome, and females do not.
All males have 47 chromosomes, and females only have 46.
All males have 46 chromosomes, and females have 47.
2. A color-blind woman marries a man who is not color-blind. All of their sons are color-blind, but none of their daughters are color-blind. Color-blindness is likely (1 point)
the result of having too few chromosomes. the result of having an extra chromosome. a sex-linked trait. a recessive trait. 3. A woman who is a carrier for hemophilia marries a man who does not have the disease. If the couple has a daughter, what are the chances that their daughter would have hemophilia? (Hint: Use a Punnett square to determine the answer.) (1 point)
0 percent 25 percent 50 percent 75 percent 4. A pedigree that indicates who has cystic fibrosis in a family and identifies some members who are carriers. At the top of the pedigree, there are two sets of parents, labeled A and B (carriers) and C and D (do not have the disease). One daughter of A and B, labeled E, does not have the disease and is not a carrier. One daughter, labeled F, has the disease, and the son, labeled G, is a carrier. The only child of C and D, a daughter labeled H, does not have the disease and is not a carrier. How the son of G and H, labeled I, is affected is not given.
The pedigree above shows the family history of the recessive blood disorder sickle-cell anemia. What are the chances of the child I having the disease or carrying the gene for the disease? (1 point)
Child I has no chance of having the disease and no chance of carrying the disease.
Child I has a 50 percent chance of having the disease and a 50 percent chance of carrying the disease.
Child I has no chance of having the disease and a 50 percent chance of carrying the disease.
Child I has a 100 percent chance of having the disease and a 100 percent chance of carrying the disease.
5. Down syndrome is (1 point) a sex-linked trait. a recessive trait. the result of having too few chromosomes. the result of having an extra chromosome.