Question

Match the items in Column I with those in Column II and select the correctly matched option from those given below: 

• A. 1-(ii), 2-(iv), 3-(1), 4-(iii)
• B. 1-(iii), 2-(i), 3-(iv), 4-(ii)
• C. 1-(iii), 2-(iv), 3-(1), 4-(ii)
• D. 1-(ii), 2-(1), 3-(iv), 4-(iii)

Hint:

Mendel’s laws of inheritance form the foundation of genetic ratios. Incomplete dominance results in a 1:2:1 ratio, while test crosses give a 1:1 ratio.

Answer 1

The Correct Option is C

1. Mendelian monohybrid cross: F2 generation phenotypic ratio is 3:1.
2. Mendelian dihybrid cross: F2 generation phenotypic ratio is 9:3:3:1.
3. Incomplete dominance: Phenotypic ratio is 1:2:1 due to trait blending in heterozygotes.
4. Test cross: A cross between a heterozygous and a homozygous recessive plant yields a 1:1 phenotypic ratio in the F2 generation.