Why Does a Person with Normal Chromosomes Only Have Two

question 15

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.