Question

How is DNA inherited from each parent?

Answer 1

Method of DNA inheritance:

1. DNA is inherited from each parent by the process of reproduction.
2. Reproduction is the process of the formation of a new individual to pass down the genetics by the process of fusion of the male and female gamete.
3. DNA is passed from the mother in the egg. It is passed down from the father in the sperm.
4. The DNA in these cells is haploid i.e. n.
5. When they fertilize it becomes 2n.
6. This ensures that the genetics from both the parents is passed on without disturbing the chromosome number.
7. It is essential to note that there is a lot of variation between brothers and sisters as well.
8. This is due to the large variety of genetics available from both parents and their ancestors.
9. All variations are not visible or dominant in the case of a person. They might be visible in a progeny and not in the next.
10. The only case there is a similarity is the case of identical twins.
11. On recombination, the genes from various previous distant relatives weaken.

Percentage of DNA that is shared by each generation:

Percentage of DNA	Generation
50	Parents
25	Grandparents
12.5	Great grandparents
6.25	Great great grandparents
3.125	Great great great grandparents