For finding the different types of gametes produced by genotype AaBb, it should be crossed with genotype
1. AABB
2. aabb
3. AaBb
4. aaBB.

A normal couple has seven children (2 daughters and 5 sons). Three of the sons suffer from a hereditary disorder but none of the daughters is affected. Which is the inheritance type
1. Sex-limited recessive
2. Autosomal dominant
3. Sex-linked dominant
4. Sex-linked recessive.

A woman with 47 chromosomes due to presence of additional 21 chromosomes is characterised by
1. Super female
2. Turner’s syndrome
3. Down’s syndrome
4. Triploidy

Which one is not a hereditary disease
1. Cystic fibrosis
2. Cretinism
3. Thalassaemia
4. Haemophilia

A woman with normal vision but with colorblind father marries a colorblind man. The fourth child of the couple is a boy. This boy
1. May or may not be colorblind
2. Must be colorblind
3. Must have normal vision
4. Will be partially colorblind due to being heterozygous

Phenotype of an organism is the result to
1. Mutations and linkages
2. Genotype and environment interactions
3. Cytoplasmic effects and nutrition
4. Environmental changes and sexual dimorphism.

In Mendel’s experiments with Garden Pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledons (YY) were dominant over green cotyledons (yy). What is the expected phenotype in F₂ generation after the crossing of RRYY x rryy?

Which of the following is the most suitable medium for the culture of Drosophila melanogaster?

Cri-du-chat syndrome in humans is caused by
1. Trisomy of 21st chromosome
2. Loss of half of short arm of chromosome 5
3. Loss of half of long arm of chromosome 5
4. Fertilization of an XX egg by a normal Y- bearing sperm.

Both sickle cell anaemia and Huntington’s chorea are
1. Virus related diseases
2. Bacteria related diseases
3. Congenital disorders
4. Pollution induced disorders