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Principles of Inheritance and Variation
Molecular Basis of Mendel's Traits
1 question from 1 paper, each with its answer.
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Concepts tested
- Starch branching enzyme and wrinkled seeds
All Questions
2001 AIPMT 1 question
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Mendel obtained wrinkled seeds in pea due to deposition of sugars instead of starch. It was due to which enzyme : -The R gene of pea codes for starch branching enzyme (SBE1), which converts amylose into amylopectin.
In rr plants, a mutation (a transposon insertion) makes this enzyme non-functional. Less starch is made and more sugar accumulates in the seed.
The extra sugar draws in water by osmosis while the seed develops; when the seed matures and dries, it loses this water and shrinks, so it becomes wrinkled.
So wrinkled seeds were due to the absence of the starch branching enzyme.