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Solution


Q.

In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates           [2016]
1 the two genes are linked and present on the same chromosome  
2 both of the characters are controlled by more than one gene  
3 the two genes are located on two different chromosomes  
4 chromosomes failed to separate during meiosis  

Ans.

(1)

If in a dihybrid test cross more parental combinations appear as compared to the recombinants in F2 generation, then it is indicative of involvement of linkage. Linkage is the tendency of two different genes on the same chromosome to remain together during the separation of homologous chromosomes at meiosis. During complete linkage no recombinants are formed whereas in incomplete linkage few recombinants are produced along with parental combinations.