The plasma membrane of a cell is selectively permeable, which means it

This means that it picks and chooses what can enter and leave the cell :)

the answer would be 3

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.