AP Biologyhardmcq1 pt

A geneticist is studying the inheritance of a trait in plants. He observes that the offspring of two parents who are heterozygous for a specific gene (Tt) have a 1:1 ratio of T:tt. Which of the following is the most likely explanation for this ratio?

A.C) The trait is influenced by multiple genes

B.D) The primary reason is gametic imprinting

C.A) The parents are not truly heterozygous

D.B) There is a mutation in the gene

Explanation

Core Concept

In a scenario where the offspring of two heterozygous parents (Tt) have a 1:1 ratio of T:tt, the most likely explanation is gametic imprinting. This occurs when the expression of the gene is influenced by the parent of origin, resulting in a 1:1 ratio of T:tt.

Correct Answer

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