Principle of Inheritance and VariationMediumBloom L3

Question

In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates [NEET 2016]

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

Sol.(c) [Key Concept: Linkage — More Parental Types in Test Cross] When a test cross of F1 dihybrid flies produces MORE PARENTAL-TYPE than recombinant-type offspring, it indicates the two genes are LINKED (on the same chromosome). Linked genes tend to be inherited together as parental combinations, producing fewer recombinant types (which require crossing over). If genes were on different chromosomes (independent assortment), parental and recombinant types would be produced in approximately equal proportions. The excess of parental types is the hallmark of linkage (incomplete linkage).

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