Because b appears to be an intrusion, the answer should be A.
It is called chromatin, it is unraveled DNA
Dolly was a first mammal cloned from an adult somatic cell, she was a domestic sheep, using the process of nuclear transfer. Dolly showed that genes in the nucleus of such a mature differentiated somatic cell are still capable of reverting to an embryonic totipotent state.
The totipotent cell is a cell that can form all the cell types in the body, it has an ability of a single cell to produce and divide all of the differentiated cells in an organism.
A carrier of a trait has both a dominant and recessive allele, but only the dominant allele is shown.