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

  1. A
    Chromosomes failed to separate during meiosis
  2. B
    The two genes are linked and present on the same chromosome
  3. C
    Both of the characters are controlled by more than one gene
  4. D
    The two genes are located on two different chromosomes

Solution & Step-by-step Explanation

When two genes in a dihybrid cross are situated on the same chromosome and are physically close, they tend to be inherited together. This phenomenon is called linkage. It results in a higher frequency of parental types and a lower frequency of recombinants than the ratio expected from independent assortment.

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In a testcross involving dihybrid flies, more parental – type offspring were produced than the recombinant – type offspring. This indicates:
A
Chromosomes failed to separate during meiosis
B
The two genes are linked and present on the same chromosome
C
Both of the characters are controlled by more than one gene
D
The two genes are located on two different chromosomes

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GeneticsLinkage

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