The prefix pheno- is derived from a Greek term meaning to show." How does
knowledge of this word part aid in decoding the term phenotype?

It helps, because phenotypes are what the genes SHOW in the organism, like coat color or ear shape.

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.