In a true breeding tall or dwarf pea variety the possible set of allelic pair(s) of genes for height are

(1) TT, Tt, tt

(2) TT, tt

(3) TT

(4) tt

Which of the following is a monohybrid? 

1. TT

2. tt

3. Tt

4. None

Test cross is used to predict the

(1) Phenotype of test organism

(2) Sex of test organism

(3) Genotype of test organism

(4) Genotypic ratio.

Genotypic and phenotypic ratios of monohybrid cross are

1. 3:1 and 1:2:1

2. 1:2:1 and 3:1

3. 1:2:1 and 1:2:1

4. 3:1 and 3:1

What is the means of segregation in Law of segregation? 

1. Allelic separation

2. Chromosomal separation

3. Crossing over

4. Linkage

Incomplete dominance is present in

1. Snapdragon flower

2. Dog flower

3. Antirrhinum flower

4. All of the above

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