Genes which code for a pair of contrasting traits are known as

(1) Factors

(2) Alleles

(3) Linked genes

(4) Lethal genes

ABO blood groups are controlled by which gene

(1) a

(2) I

(3) b

(4) All of the above

Co-dominance refers to the condition where F1

(1) resembles the dominant parent

(2) is in-between the parents

(3) resembled the recessive parents

(4) resembles both the parents

What does Blending inheritance refers to? 

(1) Mixed characters in an offspring

(2) Dominant character

(3) Recessive character

(4) Dominant & recessive character

In human ABO blood grouping possible number of genotypes is

(1) 3

(2) 4

(3) 6

(4) 9

Recessive character is expressed in

(1) F0

(2) F1

(3) F2

(4) Never expressed.

Our ancestors knew about the inheritance of characters and variations because-

(1) They selectively breed plants and animals and selected for organisms that possessed desirable characters.

(2) They introduced mutations

(3) They performed natural hybridisation

(4) All of the above

Monohybrid cross can be defined as

(1) Cross between plants differing in one chromosome

(2) Cross between plants differing in one character only

(3) Cross between plants differing in two traits

(4) All of the above

Types of gametes produced by a homozygous parent

(1) many

(2) single type

(3) depends upon number of genes

(4) depends upon number of chromosomes

If a man consists of an extra copy of chromosome number 18, then the condition is known as

1. Monosomy

2. Trisomy

3. Nullisomy

4. Polyploidy