Principle of Inheritance and VariationMediumBloom L3
Question
In our society women are blamed for producing female children. Choose the correct answer for the sex-determination in humans
Options
A.Due to some defect in the women
B.Due to some defect like aspermia in man
C.Due to the genetic make up of the particular sperm which fertilizes the egg
D.Due to the genetic make up of the egg
Solution
Sol.(c) [Key Concept: Sex Determination — Sperm Determines Sex] In humans, the sex of the child is determined by the GENETIC MAKEUP OF THE SPERM (not the egg). All eggs contain one X chromosome; sperm can contain either X or Y chromosome. X-bearing sperm + egg → XX = female; Y-bearing sperm + egg → XY = male. The father contributes the sex-determining chromosome, not the mother. Women contribute only X chromosomes in their eggs and cannot be 'blamed' for producing females. It is the father's sperm type that determines the child's sex.
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