Question

what is a gene?
a section of a protein that codes for dna
the alternate version of a trait
the visible trait in the f₁ generation
a section of dna that codes for a specific trait

Explanation:

To determine the correct definition of a gene, we analyze each option:

• The first option is incorrect because genes are made of DNA and code for proteins (or traits), not the other way around (a section of protein coding for DNA).
• The second option describes an allele, not a gene. Alleles are alternate versions of a gene.
• The third option refers to the dominant phenotype in the F₁ generation, which is not the definition of a gene.
• The fourth option correctly defines a gene: a section of DNA that contains the instructions (codes) to produce a specific trait (either a protein or a functional RNA that leads to a trait).

Answer:

D. a section of DNA that codes for a specific trait (assuming the options are labeled A - D with the last option being D; if the original options had different labels, adjust the label but keep the text: e.g., if the last option is the 4th, and labeled as D, then D. a section of DNA that codes for a specific trait)