2nd Year Biology Chapter 6 TestINHERITANCE

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. If a father has an X-linked dominant trait, who among his children will inherit it?

   1. All of his sons

   2. Half of his sons and half of his daughters

   3. None of his children

   4. All of his daughters

2. Why is the AB blood group called the universal recipient?

   1. It lacks both antigen-A and antigen-B on RBCs

   2. It lacks both anti-A and anti-B antibodies in plasma

   3. It contains all possible antigens and antibodies

   4. It can produce its own blood cells rapidly

3. Which of the following is a human example of a Y-linked trait?

   1. Muscular dystrophy

   2. Hypertrichosis

   3. Red-green colour blindness

   4. Vitamin D-resistant rickets

4. What pigment directly determines how dark or light human skin color will be?

   1. Carotene

   2. Melanin

   3. Haemoglobin

   4. Bilirubin

5. Unlike polygenic inheritance which shows continuous variation, epistasis usually leads to:

   1. Discontinuous variation

   2. No phenotypic variation

   3. Complete blending of alleles

   4. Environmental modification only

6. Which genotype will definitely result in a yellow coat color in Labradors, regardless of the B gene alleles?

   1. BBEE

   2. bbee

   3. BbEe

   4. bbEE

7. Which type of haemophilia is an autosomal recessive trait and presents equally in both genders?

   1. Haemophilia A

   2. Haemophilia B

   3. Haemophilia C

   4. All types of haemophilia

8. Chromosomes that are perfectly similar in both male and female animals are called:

   1. Sex chromosomes

   2. Autosomes

   3. Linked genes

   4. Homologous pairs

9. Which of the following is NOT one of the four gamete combinations produced by a dihybrid plant with genotype RrYy?

   1. RY

   2. Ry

   3. rr

   4. ry

10. Individual allele pairs for seed shape (round vs. wrinkled) and seed color (yellow vs. green) each exhibit which phenotypic ratio on their own?

    1. 9:3:3:1

    2. 1:2:1

    3. 3:1

    4. 1:1