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.