ABO blood grouping provides an example of

(i) co-dominance

(ii) Multiple allelism

(iii) Incomplete dominance

(1) i and iii

(2) i and ii

(3) ii and iii

(4) i, ii and iii

A cross was performed between pea plants P1 (violet flower) and P2 (white flower). If obtained progeny showed ratio of 1 (violet) : 1 (white) , then determine the genotype of P1. 

(1) Homozygous recessive

(2) Heterozygous

(3) Homozygous dominant

(4) Can’t be determined

Recessive allele of an enzyme coding gene may be responsible for the production of

(1) The normal/less efficient enzyme

(2) A non-functional enzyme

(3) No enzyme at all

(4) Any of the above.

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