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NEET2011ZoologyPrinciples of Inheritance and VariationActual

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

Options

  1. ATwo X-chromosomes
  2. BOnly one Y-chromosome
  3. COnly one X-chromosome
  4. DOne X and one Y-chromosome

Correct answer

A. Two X-chromosomes

Step-by-step solution

The sex determining mechanism in case of humans is XY type. Sperms are of two types, one containing X-chromosome and another containing Y-chromosome. The ovum is of one type only, ie, contain X chromosome. The fertilization of ovum with Y-chromosome carrying sperm results into a male offspring.

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