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Home » 170. In a testcross involving F1 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 chromosome (4) Both of the characters are controlled by more than one gene
170. In a testcross involving F1 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 chromosome (4) Both of the characters are controlled by more than one gene
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170. In a testcross involving F1 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 chromosome (4) Both of the characters are controlled by more than one gene

Solution: (3) When a plant genotype Aa Bb crosses with aabb, Independent Assortment produces four types of progeny in equal proportions.

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.

i

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