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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

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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         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

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