NEET 2011 · Class 12

Principles of Inheritance and Variation

Which one of the following conditions correctly describes the manner of determining the sex?

  1. (A)Homozygous sex chromosomes (ZZ) determine female sex in birds.
  2. (B)XO type of sex chromosomes determine male sex in grasshopper.
  3. (C)XO condition in humans as found in Turner's syndrome, determines female sex.
  4. (D)Homozygous sex chromosomes (XX) produce male in Drosophila.

The NCERT line that answers it

Verbatim line

Grasshopper is an example of XO type of sex determination in which the males have only one X-chromosome besides the autosomes, whereas females have a pair of X-chromosomes.

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

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 'Grasshopper is an example of XO type of sex determination in which the males have only one X-chromosome besides the autosomes', which directly matches option B's claim that 'XO type of sex chromosomes determine male sex in grasshopper'.

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