AIIMS 2017 Botany Mendelian Inheritance MCQ Question
In pea plants, green pod colour is dominant over yellow pods. 1000 seeds taken from a pea plant on germination produces 760 green pod and 240 yellow pod plants. The parental genotype and phenotype of the seed plant are
heterozygous and yellow
heterozygous and green
homozygous and yellow
homozygous and green
Correct Answer
Detailed Explanation
The parental genotype of the seed plant is homozygous for yellow pods (yy), as indicated by the 240 yellow pod plants produced from the 1000 seeds, which suggests a 3:1 ratio of green to yellow phenotypes. This ratio aligns with a homozygous yellow parent crossed with a heterozygous green pod parent (Yy), resulting in 75% green (Yy and YY) and 25% yellow (yy) offspring. Options A and B are incorrect because they suggest the presence of a dominant green allele, which would not yield the observed ratio, while option D is incorrect as it implies a homozygous green genotype that cannot produce any yellow offspring.
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