Sex Determination in Humans

Q.

The maleness of a child is determined by:

1. The X chromosome in the zygote

2. The Y chromosome in the zygote

3. The cytoplasm of germ cell which determines the sex

4. Sex is determined by chance

Q.

The sex chromosomes of both males and females are respectively

1. YY, XX

2. YX, XY

3. XY, XX

4. All of the above

Q.

Why are the chances of an offspring being male or female always 50:50?

1. The movement of sperm is random.

2. Equal number of X and Y bearing sperms are released.

3. The egg has no particular affinity towards an X bearing sperm or a Y bearing sperm

4. It is a coincidence

Q. A couple has 6 children, of which 5 are girls and 1 is a boy. The probability (in percentage) of having a girl next, is

1. $10\%$
2. $20\%$
3. $50\%$
4. $100\%$