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Chapter 1: Problem 32

Dimples result from a dominant gene, and a lack of dimples results from a recessive gene. Based on the information in the passage, which of the following will be true for an individual who is a hybrid? A. That individual will have dimples. B. That individual has an equal chance of either having or not having dimples. C. That individual will have a dimple on one side of his or her face, but not on the other. D. That individual will have no dimples

Short Answer

Expert verified
A. That individual will have dimples.

Step by step solution

01

Understanding dominant and recessive genes

A dominant gene is the one that will always be expressed when present in an individual, while a recessive gene is the one that is expressed only when there is no dominant gene present. In this case, dimples are a result of a dominant gene, and the lack of dimples results from a recessive gene.
02

Defining hybrid

A hybrid refers to an individual possessing one dominant gene and one recessive gene, denoted by different letters. In this case, we can denote the dominant gene (dimples) by D and the recessive gene (no dimples) by d. A hybrid individual would have the genes Dd.
03

Determining the phenotype of a hybrid

Since D (dimples) is the dominant gene and the hybrid individual has one dominant gene (D) and one recessive gene (d), the dominant gene (D) will always be expressed in the individual. This means that the individual will have dimples. Solution: Based on our understanding of dominant and recessive genes and the concept of hybrid, the correct answer is: A. That individual will have dimples.

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