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In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:
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The two genes are linked and present on the same chromosome
If a plant with genotype AaBb is crossed with that with aabb, then independent assortment would result in the production of 4 types of offsprings in equal proportion.
AaBb - gametes: AB Ab aB ab
Aabb - gametes: 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.
AaBb - gametes: AB Ab aB ab
Aabb - gametes: 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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