Answered

What is the best description of the word 'recessive' as it is used in biology?

A. An allele that is always expressed, even if there is only one copy in a cell.
B. An allele that is only expressed if two versions of it are present in a cell.
C. An allele that induces reclusive behavior in an organism.
D. Having two identical versions of an allele in a cell.



Answer :

GinnyAnswer

Final answer:

A recessive allele is only expressed when an individual has two copies of it, not in heterozygous genotypes.


Explanation:

Recessive allele: The term 'recessive allele' refers to an allele that causes a phenotype that is only seen in homozygous genotypes and never in heterozygous genotypes. A recessive allele is expressed in the phenotype only when two copies of the recessive allele are present. For example, in Mendelian genetics, if an individual inherits two copies of the recessive allele for a trait, like blue eye color, then that trait will be expressed.


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