NEET 2011 · Class 12

Principles of Inheritance and Variation

Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?

  1. (A)Two X chromosomes
  2. (B)Only one Y chromosome
  3. (C)Only one X chromosome
  4. (D)One X and one Y chromosome

The NCERT line that answers it

Verbatim line

In human beings and in *Drosophila* the males have one X and one Y chromosome, whereas females have a pair of X-chromosomes besides autosomes (Figure 4.12 a, b).

Chapter
Principles of Inheritance and Variation
Section
4.6 SEX DETERMINATION
Page
19
Words matched
28 of 28

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

How this line gives the answer

0, emb=0.9696, combined=0.9818). Verified: high — The span explicitly states 'females have a pair of X-chromosomes' which directly and conclusively establishes that two X chromosomes lead to a normal human female child, distinguishing it from all other options.

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