Lack of independent assortment of two genes A and B in the fruit fly Drosophila is due to:

1. Recombination

2. Linkage

3. Crossing over

4. Repulsion 

In a plant red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt:

1. 50% will be tall with red fruit

2. 75% will be tall with red fruit

3. All the offspring will be tall with red fruit

4. 25% will be tall with red fruit

What change occurs by changing one base in DNA:
1.  Always a change of one amino acid in protein
2.  Change in complex sequence of amino acid
3.  Always a change in property of protein
4.  Does not necessarily change the phenotype

The allele for tallness is dominant over that of dwarfness. This is called:
1.  Law of independent assortment
2.  Law of segregation
3.  Law of unit character
4.  Law of dominance

What ratio is expected in offsprings if father is colour blind and mother's father was colour blind:
1.  50% daughter – colour blind
2.  All the sons are colour blind
3.  All the daughters colour blind
4.  All the sons are normal

Among fraternal twins, one baby is haemophilic while the baby's brother is normal. Which statement is true:
1.  Baby is male
2.  Baby is female
3.  Mother is heterozygous
4.  Mother is homozygous

Minor change in a gene's structure is called:
1.  Reversible mutation
2.  Point mutation
3.  Forward mutation
4.  Backward mutation

According to Mendelism which character is showing dominance:

1. Terminal position of the flower

2. Green colour in the seed coat

3. Wrinkled seed

4. Green pod colour

Which of the following is the correct match:

1. Down Syndrome = 21st Chromosome

2. Sickel cell anaemia = X – Chromosome

3. Haemophilia = Y – Chromosome

4. Parkinson Disease = X & Y Chromosomes

Change in the sequence of nucleotides in DNA is called:

1. Mutagen

2. Mutation

3. Recombination

4. Translation