What is "set point theory"? are toxins involved? describe how body size and homeostasis are related?

Set point refers to the optimal weight range or body size that your body is designed to function. According to the theory, the human body fights bodily changes and tries to maintain homeostasis by altering body fat or metabolism. Our body can also be affected by other factors such as environmental toxins.

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.