In canaries, feather length is determined by a sex-linked gene at the G locus with two alleles. The wild-type allele produces long feathers while the dominant allele results in short feathers. An autosomal locus determines feather density (called plumage) where the dominant A allele causes dense plumage. A long-feathered female with thin plumage mates with a male that has short feathers and a dense plumage. Their first chick is a female with long feathers and thin plumage. a) What is the genotype of the male parent in this cross? b) If the next chick is a male, what is the probability of him having short feathers and thin plumage? c) A chick is caught that is pure-breeding for long feathers and dense plumage. However, you believe this chick was not from these parents. Provide a reason that supports your idea.
In canaries, feather length is determined by a sex-linked gene at the G locus with two alleles. The wild-type allele produces long feathers while the
dominant allele results in short feathers. An autosomal locus determines feather density (called plumage) where the dominant A allele causes dense
plumage. A long-feathered female with thin plumage mates with a male that has short feathers and a dense plumage. Their first chick is a female with long
feathers and thin plumage.
a) What is the genotype of the male parent in this cross?
b) If the next chick is a male, what is the probability of him having short feathers and thin plumage?
c) A chick is caught that is pure-breeding for long feathers and dense plumage. However, you believe this chick was not from these parents. Provide a
reason that supports your idea.
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