The Offspring of Two Heterozygous Gray-Bodied, Normal-Winged Flies Should Be

question 21

Multiple Choice

The offspring of two heterozygous gray-bodied, normal-winged flies should be 50% gray-bodied/normal wings (BbRr) and 50% black-bodied/vestigial wings (bbrr) because these alleles are linked. Suppose a small number, say 15%, of the offspring are instead black-bodied with normal wings. This is most likely the result of

• A) crossing-over.
• B) incomplete dominance.
• C) codominance.
• D) an error in meiosis.
• E) mutation.

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