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

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.