A and B genes are linked- What shall be genotype of progeny in a cross between AB - ab and ab-ab-A- AAbb and aabbB- AaBb and aabbC- AABB and aabbD- None

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Definition of Linkage and Linked Genes

A and B genes...

Question

A and B genes are linked. What shall be genotype of progeny in a cross between AB/ab and ab/ab:

AAbb and aabb

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AaBb and aabb

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AABB and aabb

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None

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Solution

The correct option is B AaBb and aabb
Two genes are said to be under linkage or linked when they are located on the same chromosome and have the tendency to be inherited together.
If A and B are linked, then a cross between AB/ab and ab/ab,
ab
AB AaBb
ab aabb
Therefore the progeny in a cross between AB/ab and ab/ab will have the genotype AaBb and aabb.

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Bateson used the terms coupling and repulsion for linkage and crossing over. Name the correct parental or coupling type along with its cross over or repulsion.

A) Coupling AABB, aabb ; Repulsion AABB, AAbb

B) Coupling AAbb, aaBB ; Repulsion AaBb, aabb

C) Coupling aaBB, aabb ; Repulsion AABB, aabb

D) Coupling AABB, aabb ; Repulsion AAbb, aaBB

Q. AB genes are linked. What is genotype of the progeny in a cross between AB/ab and ab/ab.

Q. In a cross between AABB

\times

aabb, the ratio of

F_{2}

genotypes between AABB, AaBB, Aabb and aabb would be

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