Question

Kari and Jamal study the results of an investigation that provide evidence for different variations of the same trait in two people who both carry Gene 1 and Gene 2. Kari and Jamal would like to determine how the different variations of the same trait are possible when the same genes are involved. The answer to which of the following questions would best help Kari and Jamal


Responses

A.
Do both genes produce a protein when expressed?
The diagram shows that when the genes are expressed, they produce a protein. Thus, answering this question would not explain a difference in observed traits.

A. Do both genes produce a protein when expressed? The diagram shows that when the genes are expressed, they produce a protein. Thus, answering this question would not explain a difference in observed traits.

B.
Are both genes found on the same chromosome?
The location of the genes on the same chromosome would not necessarily explain why they result in different traits in two individuals.

B. Are both genes found on the same chromosome? The location of the genes on the same chromosome would not necessarily explain why they result in different traits in two individuals.

C.
Do both genes share a similar location within the genetic material?

The diagram already shows us that they share a location next to each other on the DNA strand, so answering this question would not provide the information desired.

C. Do both genes share a similar location within the genetic material? The diagram already shows us that they share a location next to each other on the DNA strand, so answering this question would not provide the information desired.

D.
Are these genes regulated differently in each person?
Genes can result in trait differences when they are regulated (example: turned on or off) differently in individual cells.

D. Are these genes regulated differently in each person? Genes can result in trait differences when they are regulated (example: turned on or off) differently in individual cells.
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Answer 1

D. Are these genes regulated differently in each person?

Reason: If the same genes are present, differences in trait can arise from differences in gene regulation — when, where, and how much a gene is expressed (including epigenetic marks, transcription factor activity, alternative splicing, or environmental influences). A (protein production), B (chromosome location), and C (relative location on DNA) do not by themselves explain different phenotypes when the genes are the same.