If Every Sexually Reproducing Organism Has Only Two Alleles for Each

Multiple Choice

If every sexually reproducing organism has only two alleles for each gene,how can there be a range of traits seen for a physical characteristic?

A) One of the alleles in an organism is expressed at different levels, while the other is turned off.
B) Sometimes one of the alleles works, and other times the other allele works.
C) There can be more than two variations of a gene in a population.
D) In a population there are only two variations of a gene, but they are blended differently during sexual reproduction.