NEET 2006 · Class 12

Principles of Inheritance and Variation

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY × rryy?

  1. (A)Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons
  2. (B)Only round seeds with green cotyledons
  3. (C)Only wrinkled seeds with yellow cotyledons
  4. (D)Only wrinkled seeds with green cotyledons

The NCERT line that answers it

Verbatim line

In the dihybrid cross (Figure 4.7), the phenotypes round, yellow; wrinkled, yellow; round, green and wrinkled, green appeared in the ratio 9:3:3:1.

Chapter
Principles of Inheritance and Variation
Section
4.3.1 Law of Independent Assortment
Page
13
Words matched
27 of 27

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

How this line gives the answer

5, emb=1.0, combined=0.8). Verified: high — The span explicitly lists the four phenotypes in the F2 generation of a dihybrid cross (round, yellow; wrinkled, yellow; round, green; wrinkled, green), which directly matches option A's claim of round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons being present.

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