GENETICS AND EVOLUTION
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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1:3
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3:1
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1:3:1
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1:2:1
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Detailed explanation-1: -The F2 progeny of a monohybrid cross showed phenotypic and genotypic ratios as 1 : 2 : 1 unlike that of Mendel’s monohybrid F2 ratio.
Detailed explanation-2: -A monohybrid cross results in a phenotypic ratio of 3:1 (dominant to recessive), and a genotypic ratio of 1:2:1 (homozygous dominant to heterozygous to homozygous recessive).
Detailed explanation-3: -A cross of two F1 hybrids, heterozygous for a single trait that displays incomplete dominance is predicted to give a 1:2:1 ratio among both the genotypes and phenotypes of the offspring.
Detailed explanation-4: -So the correct option is ‘Segregation’.
Detailed explanation-5: -Final answer: F2 generation in a Mendelian cross with both genotypic and phenotypic ratios 1 : 2 : 1 is a case of incomplete dominance.