Question

which discovery did scientists make after many years of scientific research on heredity?

a. proteins are the source of inherited information.
b. the information that codes for traits is carried by dna.
c. inherited information is passed between parents and offspring by rna.
d. genes are coded on proteins that are passed down over generations.

Explanation:

Analyze the historical context of heredity research

Early scientists debated whether proteins or DNA carried genetic information. Proteins were initially favored due to their complexity, but key experiments eventually proved otherwise.

Evaluate the scientific discoveries

Experiments by Griffith, Avery-MacLeod-McCarty, and Hershey-Chase demonstrated that DNA, not protein, is the genetic material. This established that DNA carries the information coding for inherited traits.

Assess the given options

Option A is incorrect because proteins were disproven as the genetic material. Option B correctly states that DNA carries the information for traits. Option C is incorrect because DNA, not RNA, is the primary vehicle of inheritance between generations. Option D is incorrect because genes are coded on DNA, not proteins.

Answer:

• (A) Proteins are the source of inherited information.
• (B) The information that codes for traits is carried by DNA. (Correct answer)
• (C) Inherited information is passed between parents and offspring by RNA.
• (D) Genes are coded on proteins that are passed down over generations.