Question

In incomplete dominance each of the parental traits reappears in the F$_2$ generation by ...........%.

• A. 75
• B. 100
• C. 25
• D. 50

Hint:

In incomplete dominance, genotypic and phenotypic ratios are the same (1:2:1).

Answer 1

The Correct Option is A

Step 1: Understanding incomplete dominance.
In incomplete dominance, neither allele is completely dominant, and the heterozygous condition shows an intermediate phenotype.
Step 2: F$_2$ phenotypic ratio.
The F$_2$ generation shows a phenotypic ratio of 1 : 2 : 1, where both parental phenotypes appear once each.
Step 3: Calculating percentage.
Out of four offspring, three show either parental or intermediate traits. Hence, parental traits together appear in 3 out of 4 individuals.
Step 4: Final calculation.
\[ \frac{3}{4} \times 100 = 75% \]