Question

fill in the blank question
sickle cell anemia is caused by a

allele because this mutation has more than one effect on the phenotype.

Explanation:

The question describes an allele with multiple phenotypic effects, which is the definition of a pleiotropic allele. Sickle cell anemia’s mutated allele affects red blood cell shape, oxygen transport, and other traits, fitting this term.

Answer:

pleiotropic