NEET | 2016Cell Cycle and Cell DivisionHard

Question

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

Options

A.

The two genes are located on two different chromosomes

B.

Chromosomes failed to separate during meiosis

C.

The two genes are linked and present on the same chromosome

D.

Both of the characters are controlled by more than one gene

Solution

If a plant genotype Aa Bb is crossed with aabb then Independent Assortment would result in production of 4 type of offsprings in equal proportion.
Aa Bb - gametes AB Ab aB ab
Aa bb - Gametes ab ab ab ab
Offspring according to independent assortment
AaBb Aabb aaBb aabb
  1   :  1   :   1   :   1
(Parental) (Recombinants) (Parental)
Since parental percentage is more than recombinants it is due to linkage between genes A and B.

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