Question

Mendel obtained wrinkled seeds in pea due to deposition of sugars instead of starch. It was due to the enzyme

• A. Amylase
• B. Invertase
• C. Diastase
• D. Absence of starch branching enzyme

Answer 1

The correct option is D Absence of starch branching enzyme

In round seeds (RR/Rr) starch-branching enzyme (SBE-I) is found but is absent from wrinkled seeds. In rr seeds, a small DNA segment interferes with SBE-1 activity, so that starch is not formed and free sugar gets accumulated. Resulting high osmotic pressure in rr seeds leads to shrinkage and wrinkling.

Thus, the correct answer is option D.