Question

james watson and francis crick are the scientists who discovered
choose one option
a mutated cells.
b the double helix structure of dna.
c that there are dominant and recessive genes.
d evolutionary traits in human beings.

Explanation:

James Watson and Francis Crick are known for discovering the double - helix structure of DNA. Option A: Mutated cells were not discovered by them. Option C: The concept of dominant and recessive genes was established by Gregor Mendel. Option D: Studies on evolutionary traits in humans are not associated with their work.

Answer:

B. the double helix structure of DNA.