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  4. Mendel obtained wrinkled seeds in pea due to deposition of sugars instead of starch. It was due to which enzyme: -

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Q. Mendel obtained wrinkled seeds in pea due to deposition of sugars instead of starch. It was due to which enzyme : -

AIPMTAIPMT 2001

Solution:

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.