Two Plants Are Crossed, Resulting in Offspring with a 3:1

question 32

Multiple Choice

Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. What does this suggest?

• A) that the parents were true-breeding for contrasting traits
• B) that the trait shows incomplete dominance
• C) that a blending of traits has occurred
• D) that the parents were both heterozygous for a single trait
• E) that each offspring has the same alleles for each of two traits

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Definitions:

Polygenic Transmission

The process by which multiple genes contribute to the phenotypic expression of a single trait or characteristic in an organism.

Natural Selection

A fundamental mechanism of evolution, where organisms with traits better suited to their environment are more likely to survive and reproduce.

Reproductive Advantage

An evolutionary benefit that leads to an organism having more offspring than others, contributing to its genes being passed on to the next generation.

Necessary Resources

Essential materials, information, or support required for survival, growth, or the accomplishment of a task.