EVERYDAY SCIENCE

Detailed explanation-1: -3:1 ratio in F2-generation can be explained by the law of dominance. It states that, only dominant allele shows its effect even in the heterozygous condition and masks the effect of recessive allele. In the given ratio, 3 represents the dominant phenotype, while 1 represents the recessive phenotype.

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: -In a typical monohybrid cross, the F2 generation is written as 3 : 1 for phenotype but expressed as 1 : 2 :1 for genotype.

Detailed explanation-4: -The F2 progeny of a monohybrid cross showed phenotypic and genotypic ratios as 1 : 2 : 1 unlike that of Mendel’s monohybrid F2 ratio.