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NEET2013ZoologyPrinciples of Inheritance and VariationActual

In our society women are blamed for producing female children. Choose the correct answer for the sex-determination in humans.

Options

  1. ADue to some defect like aspermia in man
  2. BDue to the genetic make up of the egg
  3. CDue to the genetic make up of the particular sperm which fertilizes the egg
  4. DDue to some defect in the women

Correct answer

B. Due to the genetic make up of the egg

Step-by-step solution

In human beings both females and males have the same number of chromosomes (23 pairs). Females are homogametic with XX chromosomes (22 pairs + XX ). They produce ova having X chromosome. All ova are similar. Males are heterogametic with X and Y-chromosomes (22 pairs + XY ) . They produce two kinds of sperms, one type with X-chromosome and other with Y-chromosome. On fertilization, the zygotes may have either the X X or X Y . The zygote with XX becomes the female and the zygote with X Y becomes the male. The sex of

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