A man whose father was colour blind marries a woman who had a colourblind mother and a normal father. What percentage of male children of this couple will be colour blind?

1.	25%	2.	0%
3.	50%	4.	75%

A human female with Turner's syndrome:
1. has 45 chromosomes with XO
2. has one additional X chromosome.
3. exhibits male characters
4. is able to produce children with normal husband.

A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?
1. A., B and AB only
2. A,B, AB and O
3. O only
4. A and B only

The movement of a gene from one linkage group to another is called :
1. Duplication
2.Translocation
3. Crossing over
4. Inversion

The chromosomes in which centromere is situated close to one end are :
1. Acrocentric
2. Telocentric
3. Sub-metacentric
4. Metacentric

Multiple alleles are present :
1. At different loci on the same chromosome
2. At the same locus of chromosome
3. On non-sister chromatids
4. On different chromosomes

Which is the most common mechanism of genetic variation in the population of a sexually-reproducing organism?
1. Chromosomal aberrations
2. Genetic drift
3. Recombination
4. Transduction

Alleles are :
1. true breeding homozygotes
2. different molecular forms of a gene
3. heterozygotes
4. different phenotype

An abnormal human baby with 'XXX' sex chromosomes was born due to :
1. formation of abnormal ova in the mother
2. fusion of two ova and one sperm
3. fusion of two sperms and one ovum
4. formation of abnormal sperms in the father

In his classic experiments on pea plants, Mendel did not use
1. Pod length
2. Seed shape
3. Flower position
4. Seed colour