Valence is the number of electrons an atom must gain or lose in order to consummate its outer energy level or have a stable octet in its outer shell
The difference at a deeper depth would be water pressure crushing down on them
So understanding<span> how the </span><span>DNA </span>molecule behaves inside cells<span> helps explain how genetics works</span><span> at the simplest level. </span>
Answer: crossing over allows for genetic variation
Explanation:
crossing over is the exchange of genes between two chromosomes which ends up resulting in non-identical chromatids that comprise the genetic material of gametes (sperm and eggs).
Basically crossing over makes the chromatids that are held together by a centromere, no longer identical to eachother which creates genetic variation.
