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🔬 Biology  ·  Principles of Inheritance and Variation  ·  NEET

If both parents are carriers (Aa) of a recessive disease, probability of affected child is:

Answer: 25%.

  • A 0%
  • B 25%
  • C 50%
  • D 75%

Correct answer: B. 25%

Explanation: Aa x Aa → 25% aa. There is a 25% (1 in 4) chance of the child being homozygous recessive and showing the disease.

Monohybrid Cross: Tt x TtParent 1 (Tt)Parent 2 (Tt)gametes: T, t (from each parent)TtTtTTTtTtttRatio 1 TT : 2 Tt : 1 tt (3 tall : 1 short if T = tall is dominant)

Punnett square for a monohybrid cross between two heterozygous (Tt) parents, showing the 3:1 phenotypic ratio predicted by Mendel's Law of Segregation.

Concept context

Mendel's laws, inheritance patterns, DNA structure, and molecular biology. Core of NEET biology.

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