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NEET 2018 · BiologyPrevious Year Question

Which of the following pairs is wrongly matched?

Answer: (C) Starch synthesis in pea : Multiple alleles. Answer: (C) Starch synthesis in pea : Multiple alleles Solution: Starch synthesis in pea (alleles B and b for starch-grain size) is an example of incomplete dominance / a single gene affecting seed shape, not multiple alleles, so this pair is wrongly matched.

  1. A.XO type sex determination : Grasshopper
  2. B.ABO blood grouping : Co-dominance
  3. C.Starch synthesis in pea : Multiple alleles✓
  4. D.T.H. Morgan : Linkage

Correct Answer

(C) Starch synthesis in pea : Multiple alleles

Solution & Explanation

Answer: (C) Starch synthesis in pea : Multiple alleles Solution: Starch synthesis in pea (alleles B and b for starch-grain size) is an example of incomplete dominance / a single gene affecting seed shape, not multiple alleles, so this pair is wrongly matched. The other pairs are correct: grasshopper shows XO sex determination, ABO blood grouping illustrates co-dominance, and T.H. Morgan is associated with linkage. NCERT Reference: NCERT Class XII, Ch 4, p.62, lines 16-18: "So if starch grain size is considered as the phenotype, then from this angle, the alleles show incomplete dominance."

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