It selectively controls what goes in and out of the cell
It's the epidermis, because it is the outermost layer of our skin, it creates a waterproof barrier and creates skin color pigmentation.
The correct answer for this question would be option A. The gene is located at a specific site on a DNA strand. A DNA or <span>Deoxyribonucleic Acid </span>is a nucleic acid that carries the genetic information in cells and some viruses. Hope this is the answer that you are looking for.
For example:
If both parents are with heterozygous genotype Aa (A is dominant allele for the trait and a is recessive allele for the trait) , than
P: Aa x Aa, the offspring will be
F1: AA Aa Aa aa (one dominant homozygous, one recessive homozygous and two heterozygous.