NEET 2023 · Class 12

Principles of Inheritance and Variation

A heterozygous pea plant with violet flowers was crossed with homozygous pea plant with white flower. Violet is dominant over white. Which one of the following represents the expected combinations among 40 progenies formed?

  1. (A)30 produced violet and 10 produced white flowers
  2. (B)20 produced violet and 20 produced white flowers
  3. (C)All 40 produced violet flowers
  4. (D)All 40 produced white flowers

The NCERT line that answers it

Verbatim line

In the second case, the dominant parent is heterozygous (Ww) and produces 'W' and 'w' gametes, resulting in half heterozygous (Ww) violet offspring and half homozygous recessive (ww) white offspring.

Chapter
Principles of Inheritance and Variation
Section
4.2 INHERITANCE OF ONE GENE

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that a heterozygous dominant parent crossed with a homozygous recessive parent produces half violet (heterozygous Ww) and half white (homozygous recessive ww) offspring, which directly corresponds to the 20:20 ratio in option B.

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