Alleles are often described as being either dominant or recessive. What characte

Question

Alleles are often described as being either dominant or recessive. What characteristic of recessivealleles usually makes them 'recessive?'

A. The dominant allele acts like a regulatory gene, and never 'turns on' the recessive allele.

B. Recessive alleles are usually located on the sex chromosomes, so they cannot be expressed inordinary cells.

C. Recessive alleles have usually been deleted, so the gene no longer exists on the chromosome.

D. Recessive alleles are buried underneath a dominant allele on the chromosome, and thereforecannot be expressed.

E. Recessive alleles are usually defective and don't actually code for a functioning protein.

Explanation / Answer

Alleles are often described as being either dominant or recessive. The characteristic by which recessive alleles usually makes them 'recessive' is Recessive alleles are usually defective and don't actually code for a functioning protein.

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