AaBb people are crossed to aabb people. The following progeny were observed: 5 AaBb, 45aaBb, 45 Aabb, 5 aabb. Two of the AaBb progeny were then crossed to each other. Which of the following would be the non recombinant chromosomes in this cross (AaBbxAaBb) ? a. AB and abb. aB and abc. Ab and abd. aB and Ab

Non recombinant chromosomes in this cross are

A) AB and ab and

D) aB and Ab because

both these produces AaBb progeny

Explanation:

Cross between AaBb X aabb

Gametes formed AB, Ab, aB, ab X ab, ab, ab, ab

Progeny produced = 5 AaBb, 45 aaBb, 45 Aabb, 5 aabb.

AaBb progeny crossed again AaBb X AaBb

Gametes formed AB, Ab, aB, ab X AB, Ab, aB, ab

Progeny produced

AB Ab aB ab

AB AABB AABb AaBB AaBb

Ab AABb AAbb AaBb Aabb

aB AaBB AaBb aaBB aaBb

ab AaBb Aabb aaBb aabb

Non recombinant chromosomes in this cross are

A) AB and ab and

D) aB and Ab because

both these produces AaBb progeny