Question

Which one of the following genotype will show darkest kernel in wheat?

• A. AAbb
• B. AABb
• C. AABB
• D. AaBb

Hint:

In polygenic traits, intensity increases with the number of dominant alleles.

Answer 1

The Correct Option is C

Step 1: Understanding polygenic inheritance in wheat kernel colour.
Kernel colour in wheat is a classic example of polygenic inheritance, where more than one gene contributes additively to the phenotype.
Step 2: Effect of dominant alleles.
Each dominant allele contributes to increased pigment intensity. The greater the number of dominant alleles present, the darker the kernel colour.
Step 3: Analysis of options.
(A) AAbb: Contains two dominant alleles.
(B) AABb: Contains three dominant alleles.
(C) AABB: Correct — contains four dominant alleles, producing the darkest kernel colour.
(D) AaBb: Contains two dominant alleles.
Step 4: Conclusion.
The genotype with the maximum number of dominant alleles, AABB, will show the darkest kernel in wheat.