Genotypes: The genotypes of the given phenotypes are:
• tk+, tk (thick wings)
• f+, f (flat wings)
• b+, b (blunt)
Suppose a geneticist uses a three-point testcross to map three recessive, linked hummingbird wing-shape mutations called tk, f, and b, where tk is associated with thick wings; f is associated with flat wings; and b is associated with blunt wings. He first crosses homozygous blunt birds to homozygous thick, flat birds. Next, he backcrosses the F1 progeny to thick, flat, blunt birds. He obtained the following results.
Given this data, label the progeny phenotypic classes as either parental, single crossover (SCO), or double crossover (DCO) recombinant types. Each label may be used multiple times. Two classes have already been filled in for you.
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