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?

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?, 25 %, 50 %, 75 %, 100 %

MARKS App · 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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