GENETICS AND EVOLUTION
INHERITANCE AND VARIATION
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The alleles of two genes are interacting with each other
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Its multigenic inheritance
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It exhibits multiple allelism
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The alleles of two genes are segregating independently
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Detailed explanation-1: -In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that the alleles of two genes are segregating independently. This ratio is obtained when both the parents are heterozygous for both the genes.
Detailed explanation-2: -This 9:3:3:1 phenotypic ratio is the classic Mendelian ratio for a dihybrid cross in which the alleles of two different genes assort independently into gametes.
Detailed explanation-3: -So the correct option is “The alleles of two genes are segregating independently.".
Detailed explanation-4: -The hypothesis that color and shape genes assort independently thus predicts that the F2 generation will display a 9:3:3:1 phenotypic ratio: nine individuals with round, yellow seeds, three with round, green seeds, three with wrinkled, yellow seeds, and one with wrinkled, green seeds.
Detailed explanation-5: -The probabilities of different offspring genotypes and phenotypes can be determined using a Punnett square. A dihybrid cross results in a roughly 9:3:3:1 ratio of offspring phenotypes.