“Chromosomes, which are seen in all dividing cells and pass from one generation to the next, are the basis for all genetic inheritance”.
This statement is credited to:
1. Watson and Crick
2. Hershey and Chase
3. Sutton and Boveri
4. Meselson and Stahl

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.

During his observation of spermatogenesis in few insects, Henking found that a nuclear structure was received by 50 % of the sperms. He called this structure as:
1. X – body
2. Y – body
3. X – chromosome
4. Y – chromosome

In birds, the mechanism of sex determination is:
1. XX – XY; male heterogamety
2. XX – XY; female heterogamety
3. XX – XO; male heterogamety
4. ZZ – ZW; male heterogamety

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 individual affected with Turner’s Syndrome:
I. Is a female
II. Has 45 chromosomes
III. Has rudimentary ovaries
Of the above statements, the correct statements are:
1. Only I and II                       2. Only I and III
3. Only II and III                    4. I, II and III

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