Biology – Class 12 Practice Test 3

1. Which of the following determines the sex of the offspring in male heterogametic conditions?

It cannot be determined

Sperm

Both egg and sperm

Egg

2. On how many loci the genes responsible for skin colour are present?

Three

Five

Four

Two

3. The genotypic ratio observed in incomplete dominance is different from the genotypic ratio observed in complete dominance.

False

True

4. Paracentric is a type of inversion involving centromere.

False

True

5. The dihybrid cross was used by Mendel to derive the law of dominance.

False

True

6. Who interpreted by observing the independent segregation of chromosomes during meiosis, that the factors they carry would also separate independently?

Newton and Einstein

Crick and Watson

Sutton and Boveri

Franklin and Wilkins

7. How is pleiotropy different from polygenic inheritance?

Multiple genes control a single character

A single gene can exhibit multiple expressions

A single gene exhibits only a single expression

Two genes exhibit a single character

8. One of the significant drawbacks of Mendel’s work was _________

inability to prepare proper notes

his study on pea plants

inability to isolate factors

inability to show the factors being continuous

9. Which of the collect cross that was performed by Morgan?

Yellow-bodied, white-eyed males with brown-bodied, red-eyed females

Yellow-eyed, white-bodied females with brown-eyed, red-bodied males

Yellow-eyed, white-bodied males with brown-eyed, red-bodied females

Yellow-bodied, white-eyed females with brown-bodied, red-eyed males

10. Which of the following is an instance of codominance?

Flower color in garden peas

Pod color in garden peas

Flower color in snapdragon

Blood grouping in humans