GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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1:2:1 (1AA:2Aa:1aa)
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3:1
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1:2
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1:4
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Detailed explanation-1: -The expected genotype ratio when two heterozygotes are crossed is 1 (homozygous dominant) : 2 (heterozygous) : 1 (homozygous recessive).
Detailed explanation-2: -1:1:1:1 is the phenotypic ratio which is classic Mendelian ratio for a test cross in which the alleles of the two genes assort independently into gametes (BbEe X bbee). It is a test done to investigate the genotype of parents.
Detailed explanation-3: -Answer and Explanation: If two heterozygous individuals are crossed, then the phenotypic ratio of the offspring would be 3:1(dominant:recessive).
Detailed explanation-4: -Final answer: F2 generation in a Mendelian cross with both genotypic and phenotypic ratios 1 : 2 : 1 is a case of incomplete dominance.
Detailed explanation-5: -The heterozygous progeny is formed when these gametes fuse together. As a result, all of the offspring are Heterozygous AaBb. The ratio of F, genotypes between AABB, AaBB, Aabb, and aabb in a hybrid between AABB and aabb would be 1 : 2 : 2 : 1.