NEET Biology question

In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates

(A)The two genes are linked and present on the same chromosomeCorrect
(B)Both of the characters are controlled by more than one gene
(C)The two genes are located on two different chromosomes
(D)Chromosomes failed to separate during meiosis

Answer: (A)

Solution

When a dihybrid test cross yields more parental-combination offspring than recombinant-combination offspring, this is the classic signature of linkage — the two genes lie close together on the same chromosome and tend to be inherited together, with only a minority of recombinants arising from crossing over. Option (b)

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Question ID VK-120151