Sex Determination in Human

Q.

What is the opposite gender of a Gentleman

Q. Colour blindness is a X linked recessive disorder in which the eye fails to distinguish between red and green colours. If a colour blind woman with genotype ($X^C{X}^C$) marries a normal visioned man (XY). Which among the following possibilities are true for their male children?

1. All will be colour blind
2. 75% possibility of being colour blind
3. 50% possibility of being colour blind
4. All will be normal visioned

Q. Question 3
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?

Q. Blue eye colour in humans is recessive to brown eye colour. The expected children of a blue-eyed woman and a brown-eyed man who had a blue-eyed mother are likely to be:

1. Only blue-eyed
2. Only brown-eyed
3. Either blue-eyed or brown-eyed
4. None of the above

Q.

A married woman has three daughters. Her husband blames her for her inability to give birth to a male child. The husband's claim is right.

1. True
2. False

Q. ______ are homologous chromosomes which are similar in both the sexes.

1. Lysosomes
2. Allosomes
3. Autosomes
4. Chromosomes

Q. Study the pedigree chart given below and identify the type of inheritance.

1. Autosomal recessive
2. Autosomal dominant
3. X-linked dominant
4. Incomplete dominance

Q.

A man with blue eyes and black hair marries a woman with black eyes and brown hair. A year later they have a child. The child has blue eyes and black hair. If black eyes (B) are dominant over blue eyes (b) and black hair (H) is dominant over brown hair (h), which of the following options correctly predicts the genotype of the child?

1. bbHH

2. BbHh

3. BBHH

4. bbHh

Q.

In a human being blue are recessive to brown eye. If a boy has brown eyes but is mother has blue eyes then what will be the phenotype and genotype of his father

Q.

A man with blue eyes and black hair marries a woman with black eyes and brown hair. A year later they have a child. The child has blue eyes and black hair. If black eyes (B) are dominant over blue eyes (b) and black hair (H) is dominant over brown hair (h), which of the following options correctly predicts the genotype of the child?

1. bbHH

2. BBHH

3. BbHh

4. bbHh

Q.

A man with blue eyes and black hair marries a woman with black eyes and brown hair. A year later they have a child. The child has blue eyes and black hair. If black eyes (B) are dominant over blue eyes (b) and black hair (H) is dominant over brown hair (h), which of the following options correctly predicts the genotype of the child?

1. bbHh

2. BbHh

3. bbHH

4. BBHH

Q. Amongst the following, who has a perfect pair of sex chromosomes?

1. a boy
2. both boy and a girl
3. a girl
4. neither boy nor girl

Q. How many sex chromosomes are present in a normal human gamete?

1. 2
2. 1
3. 4
4. 3

Q. Match the following

1. Two X chromosomes
2. 22 + X/Y
3. 22 + X
4. X and Y chromosome

Q.

A man with blue eyes and black hair marries a woman with black eyes and brown hair. A year later they have a child. The child has blue eyes and black hair. If black eyes (B) are dominant over blue eyes (b) and black hair (H) is dominant over brown hair (h), which of the following options correctly predicts the genotype of the child?

1. bbHh

2. bbHH

3. BBHH

4. BbHh

Q. How many sex chromosomes are present in a single cell of human beings?

1. 23
2. 2
3. 4
4. 22

Q. The gene for brown eyes is dominant over the gene for blue eyes. Identify the correct statements from the following.

1. Both brown-eyed parents can have blue-eyed child.
2. Both blue-eyed parents will have a blue-eyed child.
3. Blue-eyed person will always have both their alleles different from a brown-eyed person.
4. For a child to be brown-eyed, atleast one parent should be brown-eyed.