Why Does a Person with Normal Chromosomes Only Have Two

Multiple Choice

Why does a person with normal chromosomes only have two alleles for any single gene trait?

A) A minimum of two alleles is required for the expression of monogenic traits.
B) When a dominant allele is paired with a recessive allele, only the dominant allele is expressed, and the recessive allele is silent.
C) One allele for the monogenic trait is on the paternally derived chromosome, and the other allele is on the maternally derived chromosome.
D) Expression of more than two alleles of any single-gene trait results in enhanced expression of recessive alleles and suppressed expression of dominant alleles.