What determines each organism’s unique traits? In other words, what creates the variation that we see in organisms?

Select one:
a. The combination of alleles within each organism
b. The alleles donated from the mother and the father
c. The variation in the DNA code
d. All of the above.

and

There are several factors that lead to genetic variation in organisms. Which of the following is NOT one of those factors?

Select one:
a. The random combination of alleles from both parents
b. The process of crossing over during meiosis
c. The formation of sperm and egg cells during meiosis
d. Producing offspring that are genetically identical to the parents