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.D) The primary reason is gametic imprinting

B.C) The trait is influenced by multiple genes

C.B) There is a mutation in the gene

D.A) The parents are not truly heterozygous

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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