Multiple alleles are present:

1. on different chromosomes
2. at different loci on the same chromosome
3. at the same locus of the chromosome
4. on non-sister chromatids

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

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

A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offspring?

Fruit colour in squash is an example of:

1. Recessive epistasis

2. Dominant epistasis

3. Complementary genes

4. Inhibitory genes

A man whose father was colour blind marries a woman who had a colour blind 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 chromosome.

3. exhibit male character

4. is able to produce children with a normal husband.