Which of the following is an example of how a scientist might use a model?

marbles place inside a hollow sphere are used to describe protons in nucleus

a wrench in used to tighten a nut onto a piece of wood

microscopes are used to magnify a group of cells on sets of slides

stopwatches measure the amount of time it takes for runners to complete a mile

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)

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;

the answer is cell division : )