Sex Determination in Humans

Q.

A cell has two threadlike linear strands of DNA in its nucleus, each called a chromosome. Each cell will have two copies of each chromosome;

1. one each from the male and female parents.

2. both from the male parent.

3. both from the female parent.

4. both different from those of the parents.

Q.

Which of the phases of mitosis is the longest?

1. Prophase

2. Metaphase

3. Anaphase

4. Telophase

Q.

An egg usually has X chromosome, but in some cases it can have Y chromosome.

1. True

2. False

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. $100\%$

Q. Probability of four son to a couple is:

1. $\frac{1}{4}$
2. $\frac{1}{8}$
3. $\frac{1}{16}$
4. $\frac{1}{32}$

Q.

at what stages does meiosis takes place in d life cycle of living oragnism ?

Q.

In human beings, sex of an individual is determined:

1. During the initial stages of pregnancy

2. At the time of fertilization

3. During the later stages of pregnancy

4. By the environmental factors