Question

$3:1$ratio in $F_2$-generation is explained by

• A. law of partial dominance
• B. law of dominance
• C. law of incomplete dominance
• D. law of purity of gametes

Answer 1

Answer: (B)

$3:1$ ratio in $F_2$-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.