T. H. Morgan worked on the fruit fly, Drosophila melanogaster . Which of the following is not an advantage of this fly?
1. They could be grown on simple synthetic medium in the laboratory.
2. They complete their life cycle in about two years, and a single mating could produce a large number of progeny flies.
3. There was a clear differentiation of the sexes – the male and female flies are easily distinguishable.
4. It has many types of hereditary variations that can be seen with low power microscopes.

When the two genes in a dihybrid cross are situated on the same chromosome:
1. The proportion of parental gene combinations was much higher than the non-parental type.
2. The proportion of parental gene combinations was much lesser than the non-parental type.
3. The proportion of parental gene combinations was equal to the non-parental type.
4. Only recombinants are formed.

It is unfortunate that in our society women are blamed for producing female children and have been ostracised and ill-treated because:

The family pedigree of Queen Victoria shows a number of haemophilic descendants as she was:
1. Affected by the disease
2. Carrier for the disease
3. Did not carry the allele for hemopihilia
4. Was not a queen

Which of the following amino acid substitution in the beta chain of the haemoglobin molecule leads to the development of sickle cell anaemia?
1. Arginine by tyrosine                  2. Tyrosine by phenylalanine
3. Valine by Glutamic acid             4. Glutamic acid by Valine

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

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