Sex Determination

Q.

An abnormal human baby with ‘XXX’ sex chromosomes was born due to-

1. fusion of two sperms and one ovum

2. fusion of two ova and one sperm

3. formation of abnormal ova in the mother

4. formation of abnormal sperms in the father

Q.

What are the types of sperms?

Q.

The number of pair(s) of sex chromosomes in the zygote of humans is

1. One

2. Two

3. Three

4. Four

Q.

Define the terms:

(c) Sex chromosome

Q.

Is there a YY gender?

Q. Mother is responsible for determination of sex of the baby.

1. False
2. True

Q.

The number of chromosomes in human ovum is

1. 21

2. 22

3. 23

4. 24

Q.

Why are males called heterogametic?

Q.

If the sex chromosomes of a fertilized egg is (XX), the baby is a ___ child.

Q.

Why do all the gametes formed in human females have an X chromosome?

Q.

why do sex cells have only half no. Of chromosomes than other cell.

Q. What will be the sex of the child born:

\((a)\) if \(X\) chromosome carrying sperm fuses with an egg cell carrying \(X\) chromosome?

Q.

Good morning

What chromosomes do transgenders have?

Thank you

Khushi.

Q.

Are female birds heterogametic?

Q.

Sex of a plant can be changed by which hormone.

Q.

Give scientific reason:

Sometimes amniocentesis can be misused.

Q.

Which of the following combinations of sex chromosomes produces a male child (or boy) ?

XX or XY

Q.

What are sex chromosomes ? Name the two types of sex chromosomes.

Q. A female gamete carries ________ chromosome(s).

1. one X
2. two X
3. one X and one Y
4. one Y

Q.

State whether the following statements are true or false :

(a) The estrogen hormone develops deeper voice in males at puberty.

(b) Menstruation stops in men permanently around the age of 45 to 50 years.

(c) Man (father) is responsible for the sex of the baby.

(d) The sex chromosomes in all the gametes (sperms) of a man are not identical.

(e) Half the female gametes contain X chromosomes and the other half contain Y chromosomes.

(f) It is the sperm which determines the sex of a child.

(g) Each normal cell in our body contains 23 chromosomes.

(h) A girl should not be allowed to work in the kitchen during menstruation.

(i) A woman (mother) is responsible for the sex of her child.

(j) Metamorphosis in insects (like silk moth) is brought about by thyroxine hormone.

Q.

The human body has 46 chromosomes out of which two chromosomes participate in determining the gender of the baby. What are those chromosomes called?

1. Sex chromosomes

2. Autosomes

3. Both A and B

4. Neither A nor B

Q.

The human cell consist of ................... pairs of homologous and non-homologous chromosomes respectively.

1. 22 +23

2. 22+01

3. 22+46

4. 46 +23

Q.

Raj kumar and his wife Sunita have been blessed with a baby girl. On the other hand, Kripa Shanker and his wife Vimla have been blessed with a baby boy. What type of sex chromosome has been contributed :

(a) by Raj Kumar (b) by Sunita (c) by Kirpa Shanker (d) by Vimla

Q.

Mohan’s mother has delivered a baby girl. He wants to know from his teacher how eggs get converted into a baby boy or a baby girl. The teacher tells him that there are two types of sex chromosomes X and Y. The fusion of these sex chromosomes through gametes leads to the birth of a baby boy or a baby girl. Baby girl is born when a sperm containing

1. Y chromosomes fuses with an egg containing X chromosome

2. X chromosome fuses with an egg containing X chromosome

3. Y chromosome fuses with an egg containing Y chromosome

4. X chromosome fuses with an egg containing Y chromosome

Q.

A woman has two sex chromosomes. One is X, the other is:

1. Y

2. X

3. None of these

4. Z

Q. During the fusion of the male and female gametes, the male gamete with chromosome Y, fused with the female gamete with chromosome X. The offspring born will be _________.

1. A girl
2. A boy
3. None of these
4. Twins

Q.

Mention the sex chromosomes in a male and female embryo.

Q. Which of the following correctly describes the genetic constitution of a female child in humans?

1. 44 + XY
2. 22 + XY
3. 44 + XX
4. 22 + YY

Q. DNA replication takes place in
(a) mitosis
(b) amitosis
(c) meiosis
(d) both (a) and (c)

Q.

How is a fingerprint formed?