A self-fertilizing trihybrid plant forms:

1.	4 different gametes and 16 different zygotes
2.	8 different gametes and 16 different zygotes
3.	8 different gametes and 32 different zygotes
4.	8 different gametes and 64 different zygotes

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 

Life span of worker honey bee:
1.  30 days
2.  15 days
3.  90 days
4.  10 days

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

One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During the segregation of $F_2$ progenies that mutation is found in:

1. None of the progenies

2. All the progenies

3. 50% of the progenies

4. 1/3 of the progenies 

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

When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is:

1. Pentaploidy

2. Diploidy

3. Triploidy

4. Tetraploidy

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

When AABBcc is crossed with AaBbCc then the ratio of hybrid for all three genes is:
1.  1/8
2.  1/4
3.  1/16
4.  1/32