Question

(Answer in about 70 words)
1. How is sex determined in human beings? Explain with a flow chart.​

Answer 1

The last chromosome is the sex chromosome

• In father last chromosome is XY
• Whereas in mother last chromosome is XX

CASE 1:

Boy is born when:

• Mother's X gamete fuses with father's Y gamete to form XY chromosome.

CASE 2:

: Girl is born when:

• Mother's X gamete fuses with father's X gamete to form XX chromosome.

Answer 2

HEY MATE !

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.

HOPE IT HELPS !