Biology – Class 12 Practice Test 3

1. What are polygenes?

Genes involved in multiple allelism

Multiple genes for a single trait

Genes involved in quantitative inheritance

Genes involved in the qualitative inheritance

2. On which of the following chromosomal disorders are based on?

Mutant allele and imbalance in chromosome number

Mutant allele and chromosome arrangement

Mutant allele and their defective products

Imbalance in chromosome number and chromosome arrangement

3. What is the genotype of a plant showing a dominant phenotype of violet flowers if it is test crossed and produces only violet-flowered plants?

4. The lack of publicity of Mendel’s work was due to _______

lack of the availability of efficient communication methods

his deafness

him being held captive in jail

lack of his ability to communicate

5. Which of the following type of inheritance is shown by colour blindness?

Chromosomal inheritance

Up-down inheritance

Zig-zag inheritance

Criss-cross inheritance

6. How can a female be haemophilic?

Both mother and father are haemophilic

Mother is a carrier and father is haemophilic

Mother is haemophilic and father is normal

Both mother and father are carriers

7. The nature exhibits ________ variation.

continuous

discontinuous

uniform

discrete

8. For the cross of axial violet and terminal white flowers, which of the following is incorrect with regards to the F2 generation?

Axial violet are nine times more abundant than white flowers

Terminal violet flowers are three times more abundant than terminal white flowers

Terminal white flowers are thrice abundant than the axial white flowers

Axial white flowers are as abundant as terminal violet flowers

9. Which of the following statements is incorrect with respect to alpha-thalassemia?

Connected to the deletion of the 16p chromosome

Inherited in a Mendelian dominant fashion

Result in decreased α-globin production

Involves the genes HBA1 and HBA2

10. What is the full form of AHG?

Anti haemoglobin

Allergic haemoglobin

Allergic haemophilic globulin

Anti haemophilic globulin