Question

which statement best describes how a gene carries the information for a specific trait?

a. a gene is a protein that determines the sequence of nucleotides in dna.
b. a gene is composed of a chromosome that has multiple alleles for the trait.
c. a gene is a sequence of proteins the cell uses to produce different alleles.
d. a gene is a section of dna with instructions for assembling amino acids to make proteins.

Explanation:

Analyze the definition of a gene

A gene is a specific segment of DNA that contains the genetic code (instructions) required to build a functional product, typically a protein. Proteins, in turn, determine an organism's physical traits.

Evaluate the given options

• Option A states that a gene is a protein. This is incorrect; genes are made of DNA (nucleic acids), not proteins.
• Option B states that a gene is composed of a chromosome. This is backwards; chromosomes are large structures composed of DNA and proteins, containing many genes.
• Option C states that a gene is a sequence of proteins. This is incorrect; genes are sequences of nucleotides in DNA.
• Option D states that a gene is a section of DNA with instructions for assembling amino acids to make proteins. This is scientifically accurate, as the sequence of nucleotides in a gene dictates the sequence of amino acids in a protein.

Answer:

• A. A gene is a protein that determines the sequence of nucleotides in DNA.
• B. A gene is composed of a chromosome that has multiple alleles for the trait.
• C. A gene is a sequence of proteins the cell uses to produce different alleles.
• D. A gene is a section of DNA with instructions for assembling amino acids to make proteins. (Correct answer)