SELECT * FROM question_mgmt as q WHERE id=411 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=7 AND chapterId=30 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 12th biology Principles of Inheritance and Variation how is sex determined in human beings

Question: How is sex determined in human beings?

Answer:

Human beings exhibit male heterogamy. In humans, males (XY) produce two different types of gametes, X and Y. The human female (XX) produces only one type of gametes containing X chromosomes. The sex of the baby is determined by the type of male gamete that fuses with the female gamete. If the fertilizing sperm contains X chromosome, then the baby produced will be a girl and if the fertilizing sperm contains Y chromosome, then the baby produced will be a boy. Hence, it is a matter of chance that determines the sex of a baby. There is an equal probability of the fertilizing sperm haveup an X or Y chromosome. Thus, it is the genetic make up of the sperm that determines the sex of the baby.

Sex Determined In Human Beings


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