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Standard XII
Biology
The Punnett Tool
Question

In a testcross involving F1 dihybrid flies, more parental type offsprings were produced than the recombinant type offsprings. This indicates that
  1. The two genes are located on two different chromosomes.
  2. Chromosomes failed to separate during meiosis.
  3. Both of the characters are controlled by more than one gene.
  4. The two genes are linked and present on the same chromosome.

A
Both of the characters are controlled by more than one gene.
B
The two genes are located on two different chromosomes.
C
Chromosomes failed to separate during meiosis.
D
The two genes are linked and present on the same chromosome.
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Solution
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The linkage is the tendency of closely placed genes on a chromosome to stay together during inheritance (no crossover and independent assortment). Completely linked genes do not show crossover and independent assortment; thereby produce only parental combinations. Linked genes are the genes which are closely located on the same chromosome. This makes option C correct for the given case. Option A is incorrect as genes present on different chromosomes exhibit crossing over to make more recombinant offspring; not linkage. Option B is incorrect as a failure of chromosomes to separate during meiosis results in chromosomal abnormalities. Option D is incorrect as the production of recombinant and parental offspring is determined by presence or absence of crossing over; not by type of inheritance.

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