An organism with two different alleles is:

1. Homozygous for that trait
2. Homologous for the allele
3. Heterozygous for the trait
4. Heterologous for the allele

Which one of the following trait is only expressed in the presence of identical allele?

1.  Yellow seed

2.  Inflated pod

3.  Green pod

4.  Green seed

If a colourblind woman marries a man who has normal colour vision, which of the following is possible with respect to their children?

1.  All sons and daughters are colourblind.

2.  All sons and daughters are normal.

3.  100% sons are colourblind.

4.  25% daughters are colourblind.

Continuous source of variations in sexually reproducing organisms is

1.  Disjunction of chromosomes.

2.  Crossing over between sister chromatids.

3.  Crossing over between non-sister chromatids.

4.  Mutation.

The number of linkage groups in pea is

1.  14

2.  7

3.  9

4.  24

How many type(s) of gametes is/are produced by a double recessive parent?

1.  One

2.  Two

3.  Four

4.  Six

Find incorrect match

1. Polygenic inheritance – Spread across of gradient.

2. Pleiotropy – Single gene multiple phenotype.

3. X body of henking – One each in sperm.

4. Pedigree analysis – Mendelian trait.

How many of the following statements are correct?
(1) Phenyl ketonuria leads to mental retardness.
(2) Thalassemia is quantitative where as sickle-cell anaemia is qualitative.
(3) Possibility of female becoming haemophilic is extramely rare.
(4) 8% of male & 0.4% of females are haemophilic.

Options

1. All 

2. 3

3. 2 

4. 1

Which of the following traits in the garden pea plant would express itself only in homozygous condition?

1.  Violet flower color

2.  Terminal flower position

3.  Green pod color

4.  Yellow seed color

${\mathrm{F}}_1$ progeny resemble both the parents in the case of:

1.  Complete dominance

2.  Incomplete dominance

3.  Codominance

4.  Multiple allelism