I need someone to type up a bit on natural selection and population dynamic. Specifically how genetic variations of trait may increase. Only a couple sentences about each increase.

i tried the eyeshadow trick you told me about and it worked so good i i did a yellow going into orange colors and it was bright and you could see it on my eyes

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.