Question

प्रारूप बनगे।
What is co-dominance? How many types of phenotype and genotype
will be formed in F2 generation? Explain the example with the help
of checker board.​

Answer 1

Answer:

Co-dominance is the type of dominance where the offspring show similarity to both the parents and it is due to the blending of alleles.

Let us learn more about codominance in the coming lines.

When the F1 generation exhibits both the parental characters, this is called codominance. The offspring will be a combination of both the parent. The ABO blood group system is one of the best examples of codominance.

There are different types of red blood cells such as A, B, AB and O with or without the Rh factor. The difference is in the antigen present on the red blood cell surface which determines the specific blood group in an organism.

For example: If a person is blood group A, it means the RBC surface consists of antigen-A.But this is decided by the gene I.  The gene I have three types of alleles namely, IA, IB and i. The alleles IA and IB produce two different antigens while the allele-i do not produce any antigen. Hence, alleles IA and IB are dominant over the allele i.

As we know, each diploid organism bears two pairs of alleles. Hence, in humans, there are two types of alleles of any combination. Depending on the combination and dominance of allele blood type of an individual could be determined. The different combination of alleles and their type of blood groups are given below.

Explanation: