Multiple Choice
In the context of the fundamentals of genetics, which part of DNA specifically codes for traits by encoding functional products such as proteins or functional RNAs?
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1. Introduction to Genetics
Fundamentals of Genetics
Multiple Choice
Which phrase is the best definition of a gene?
A
Any region of DNA that is transcribed into mRNA, regardless of whether it produces a functional product
B
A protein that catalyzes DNA replication and is inherited from parents to offspring
C
A segment of DNA that encodes a functional product (such as a protein or a functional RNA) and includes associated regulatory sequences needed for its expression
D
A specific location on a chromosome that always determines a single trait in a one-to-one manner
Verified step by step guidance1
Step 1: Understand that a gene is a fundamental unit of heredity made up of DNA.
Step 2: Recognize that a gene includes not only the coding sequence that produces a functional product (like a protein or functional RNA) but also the regulatory sequences that control its expression.
Step 3: Note that not all DNA regions transcribed into mRNA necessarily produce functional products, so the definition must emphasize functionality.
Step 4: Exclude definitions that describe proteins or enzymes themselves as genes, since genes are DNA sequences, not proteins.
Step 5: Also exclude definitions that oversimplify gene function as a one-to-one relationship with traits, because many genes can influence multiple traits and vice versa.
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