Question

How many pairs of sex chromosomes are present in human beings ? Explain how is sex determined in human chain​

Answer 1

Answer:

1 pair of sex chromosomes

Explanation:

in humanbeings sex determination method is XX XY

XX IN FEMALE and XY IN MALE

DURING MEIOSIS division in ovum only X is present

but in male either X or Y may present

so during insemination if X goes it leads to  XX(FEMALE)

if Y enters it lesdes to XY(MALE)

Answer 2

There is only 1 pair of sex chromosome in our body out of the 23 chromosomes.

There are only X types of egg cells in the ovary of a female, but there are two types of sperms X and Y in testis of a male. If, during fertilization, the male and female gamete fusion is XX(X -egg cell and X -sperm) a girl will be born. At the same time, if the fusion is XY(X -egg cell and Y -sperm) a boy will be born.