In a family of four individuals, the father possessed long ears and the mother possessed short ears.

Question

A. In a family of four individuals, the father possessed long ears and the mother possessed short ears. If the parents had pure dominant and recessive traits respectively, then calculate the ratio of genetic makeup of F2 generation. Show a suitable cross.

B. If father had short ears and the mother had long ears, explain what effect it will have on the ratio of genetic makeup in F2 generation.

Answer 1

(Any letter which clearly indicated dominant and recessive ears, example, L or E or any other)

(A) LL × ll

 F1= Ll

 Ll X Ll

 1LL:2Ll:1ll.

(B) No change in ratio/the ratio of F2 generation will still be 1LL:2Ll:1ll/ ratio will be the same. As the cross is still between a pure dominant and recessive allele/ genes/ traits/characters /as shown in the cross above.