**Answer:**

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 ** ****<u>AaBb</u>**

**Ab **AABb AAbb **<u>AaBb</u>** Aabb

**aB **AaBB <u>**AaBb**</u> aaBB aaBb

**ab **<u>**AaBb**</u> 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