Epigenetics is the branch of genetics that is the study of mechanisms through which the gene expressions are changed while passing from one cell to the other. These modifications are external and they only turn the genes on and off and they do not affect the sequence of DNA. Moreover, these changes can be reversed too.
The physical structure of the genetic material is modified either by the addition of methyl group to the DNA molecule which does not let certain genes express themselves or by squeezing the histone structure that would not let the cell read the structure of DNA. It is due to epigenetics that the cells of skin and brain look different from each other.
Meiotic nondisjunction is much more likely than mitotic nondisjunction. Based on
A woman who is heterozygous, Bb, has brown eyes;
Explain why familial breast cancer shows a dominant pattern of inheritance in
How is an F′ factor different from an F factor?
With regard to the timing of conjugation, explain why the recipient
The raw material for evolution is random mutation. Discuss whether or
Why is an antibody used in this experiment? From
Explain the type of speciation (allopatric, parapatric, or sympatric
In fruit flies, curved wings are recessive to straight wings,
A recessive allele in mice results in an unusally long neck.
