Whyte type canaries are yelllow. A dominant mutant allel of the color gene, designated W causes white feathers. Inheriting two dominant alleles is lethal to the embryo. If a yellow canary is crossed to a white canary, what is the probability that an offspring will be yellow? What is the probability that it will be white?

An unaffected man and an unaffected woman mate and have a daughter affected with Fifimania. Which of the following mechanisms of inheritance can not be ruled out? Choose all that can not be ruled out. Autosomal Recessive Autosomal Dominant X-linked Dominant X-linked Recessive All of the mechanisms shown can be ruled out Y-linked

a. In mice, dark coat color is dominant over albino and short hair is dominant over long hair. Assume that these two traits are caused by two independently assorting genes. Hair color is determined by the (D/d) alleles. Hair length is caused by the (S/s) alleles. Two mice are crossed and result in the following progeny: 20 short-haired, dark mice and 21 short-haired, albino mice. What is the most likely genotype for the parents?   b. The researcher who is counting the mice suddenly realizes that the trait is probably X-linked as all the albino mice are one sex and all the dark mice are theoppositesex. What can you conclude about the 2 parental mice with regard to the hair color trait?

The presence of horns on satyrs is produced by a sex-influenced autosomal gene that is dominant in males and recessive in females. A horned female is crossed with a hornless male. The F1 are then intercrossed to produce the F2. What proportion of the F2 generation will be horned? O % of the males and none of the females O % of males and % of females O All of the males and none of the females O % of the males and % of females O ½ of the males and none of the females