Question

what is an exception to mendels theory of inheritance in which a single gene has multiple phenotypic effects?
epistasis
pleiotropy
diploidy
haploidy

Explanation:

To solve this, we analyze each option:

• Epistasis: Interaction between genes, not single - gene multiple effects.
• Pleiotropy: Defined as a single gene influencing multiple phenotypic traits, which matches the question's description.
• Diploidy: Refers to having two sets of chromosomes, not related to gene - phenotype effects.
• Haploidy: Refers to having one set of chromosomes, not related to gene - phenotype effects.

Answer:

B. pleiotropy