Question

if two women have identical alleles of the suspected 20 height - associated genes, why might one of those women be 5 feet 5 inches tall and the other 5 feet 8 inches tall?
○ because the identical 20 alleles cause variation in the phenotype
○ because phenotype dictates genotype
○ all of these
○ none of these
○ because environmental factors also play a role in the phenotype of this trait

Explanation:

Genotype (alleles) provides the genetic basis, but phenotype (observable trait like height) is also influenced by environmental factors (e.g., nutrition during growth). Identical alleles (same genotype) don't guarantee identical phenotypes as environment matters. Option A is wrong as identical alleles don't cause variation. Option B is incorrect as genotype dictates phenotype (not vice - versa). Since A and B are wrong, option C (all of these) is wrong. So the correct answer is E.

Answer:

E. because environmental factors also play a role in the phenotype of this trait