Why is the cell membrane described as being selectively permeable? Explain how its structure helps it to perform this function

Explanation:

the cell membrane is described as being selectively permeable because it is a selective barrier that allows passage of oxygen and nutrients into the cell and of waste material out of the cell. There are only a selected few that can pass through the membrane freely. The plasma membrane is composed up of double layers of phospholipids that has both hydrophobic and hydrophilic structures causing it to be amphipathic. There are integral proteins that are found on the surface of the membrane to help the transport of larger molecules because it provides as a hydrophilic channel.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.