Class 12 biology Principles of Inheritance and Variation Free test quiz

1. In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:

2. Conditions of a karyotype 2n ± 1 and 2n ± 2 are called

3. If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is

4. Mendel’s Law of independent assortment holds good for genes situated on the:

5. A pleiotropic gene

6. If Mendel had studied the seven traits using a plant with 12 chromosomes instead of 14, in what way would his interpretation have been different?

7. The crossing of F₁ to homozygous recessive parent is called

8. The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes?

9. Blue eye colour is recessive to brown eye colour. A brown eyed man whose mother was blue eyed marries a blue eyed women. The children shall be

10. Ratio of complementary genes is