A pea plant is heterozygous for a character and recessive homozygyous for another character. Both these characters are located on different chromosomes. Another pea plant of the same species is hetero

Question

A pea plant is heterozygous for a character and recessive homozygyous for another character. Both these characters are located on different chromosomes. Another pea plant of the same species is heterozygous for both the characters. If these plants are crossed, what proportion of their offsprings will be heterozygous only for one character?

TestHub · Accepted Answer

Aabb is crossed with AaBb. Gametes produced by Aabb is Ab and ab. Gametes produced by AaBb are AB, Ab, aB and ab. The offsprings can be tabulated as follows:

	AB	Ab	aB	ab
Ab	AABb	AAbb	AaBb	Aabb
ab	AaBb	Aabb	aaBb	aabb

The highlighted offsprings are heterozygous only for one character. Thus their proportion will be 4 out of 8 or 50%

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