Christmas disease is another name for:

1. Haemophilia B

2. Hepatitis B

3. Down's syndrome

4. Sleeping sickness

In Drosophila, the sex is determined by:
 

A genetic map is one that:

1. Establishes sites of the genes on a chromosome

2. Establishes the various stages in gene evolution

3. Shows the stages during the cell division

4. Shows the distribution of various species in a region

Independent assortment of genes does not take place when:

Mendel obtained wrinkled seeds in peas due to the deposition of sugars instead of starch. It was due to which enzyme:
1.  Amylase
2.  Invertase
3.  Diastase
4.  Absence of starch branching enzyme 

The ratio of complementary genes is:
1.  9 : 3 : 4
2.  12 : 3 : 1
3.  9 : 3 : 3 : 4
4.  9 : 7

When dominant and recessive alleles express themselves together it is called:
1.  Co-dominance
2.  Dominance
3.  Amphidominance
4.  Pseudo dominance

A and B genes are linked. What shall be the genotype of progeny in a cross between AB/ab and ab/ab:
1.  AAbb and aabb
2.  AaBb and aabb
3.  AABB and aabb
4.  None

Which statement is correct about the centre of origin of the plant:
1.  More diversity in an improved variety
2.  Frequency of the dominant gene is more
3.  Climatic conditions more favourable
4.  None

The probability of four sons to a couple is: