Codominance

Q.

What is the difference between dominance and epistasis?

Q. If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group 'AB' blood group 'B' blood group in 1:2:1 ratio. Modern techniques of protein electrophoresis reveal the presence of both 'A' and 'B' type proteins in 'AB' blood group individuals.
This is an example of :

1. Codominance
2. Incomplete dominance
3. Partial dominance
4. Complete dominance

Q. Purebred shorthorn cattle of white coat (WW) were crossed with purebred cattle of red coat (RR).

The $F_1$ cattle had coats with patches of white and red side by side. What is the phenomenon responsible for this feature?

Also what would be the phenotypic and genotypic ratios of the $F_2$ generation?

1. Independent assortment, phenotypic and genotypic ratios
   9 : 3 : 3 : 1
2. Co-dominance, phenotypic and genotypic ratios are 1 : 2 : 1
3. Multiple alleles, phenotypic ratio 3 : 1 and genotypic ratio 1 : 2 : 1
4. Incomplete dominance, phenotypic and genotypic ratios are
   1 : 2 : 1

Q.

What is the Mendels first law?

Q.

Give an example of a situation that is an exception to Mendels first principle.

Q. Choose the correct feature about the following phenomena.
I. Incomplete dominance
II. Co-dominance
III. Multiple alleles