Hemophilia A is a blood clotting disorder that is usually inherited as an X-linked recessive trait. If a woman who does not have hemophilia A has a daughter with a man who does not have hemophilia A, what is the probability that the daughter will have hemophilia A if the maternal grandfather did have hemophilia A?

Two parents are heterozygous for an allele that determines hair color for this species. These parents have offspring with the following genotypic ratios:

50% Bb, 25% BB, 25% bb

The B allele produces black hair, and the b allele produces white hair. However, the phenotypic expression of this gene's traits do not follow Mendelian patterns. If allele B exhibits incomplete dominance, which of the following is true for the offspring?

Which of the following inheritance patterns only requires a single copy of a mutant allele for presentation of a specific gene disorder?

Colorblindness is a recessive sex-linked disease that is caused by a defective gene on the X-chromosome. If a mother who is a carrier for the trait mates with a normal sighted male, what percentage of their daughters will have the disease?

Which of the following statements about autosomal-dominant disorders is false?