NEET 2016 Biology question

In a testcross involving dihybrid flies, more parental - type offspring were produced than the recombinant - type offspring. This indicates:

(1)The two genes are located on two different chromosomes
(2)Chromosomes failed to separate during meiosis
(3)The two genes are linked and present on the same chromosomeCorrect
(4)Both of the characters are controlled by more than one gene

Answer: (3)

Solution

If the two genes assort independently (located on different chromosomes), a test cross AaBb aabb gives four types of progeny in equal proportion (1 : 1 : 1 : 1), i.e. 50% parental and 50% recombinant types. When the parental types are significantly more than the recombinant types, the genes are physically

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Question ID VK-092004