Mathematical Calculation of Mendelian Analysis MCQ

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In a monohybrid cross between two pea plants, one with a homozygous dominant genotype (AA) and the other with a heterozygous genotype (Aa), what is the expected genotypic ratio of the offspring?

1:2:1

1:1

3:1

1:0:1

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Mendel crossed tall pea plants with dwarf ones. The F1 plants were all tall. When these F1 plants were selfed to produce F2 generation, he got a 3:1 tall to dwarf ratio in the offspring. What is the probability that out of three plants (of F2 generation) picked up at random two would be dwarf and one would be tall?

3/4

3/8

9/64

9/32

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Concepts Covered - 1

Mathematical Calculation of Mendelian Analysis

To calculate the number of gametes that would be formed in a given genotype = 2ⁿ; where n = number of heterozygous genes.
To calculate the number of possible genotypes in a given progeny = 3ⁿ; where n = type of cross.
To calculate the frequency of least common genotype in a given progeny = (1/4)ⁿ; where n = type of cross.
To calculate the frequency of different phenotypes in a given progeny = 2ⁿ; where n = type of cross.
To calculate the phenotypic ratio of a particular cross = (3 : 1)ⁿ; where n = type of cross.
To calculate genotypic ratio of a particular cross = (1 : 2 : 1)ⁿ; where n = type of cross.
To calculate the total number of progeny = (4)ⁿ; where n = type of cross.