Which description is the best definition of a single nucleotide polymorphism, or snp?

What is a gene ? a) a section of a protein that codes for dna. b) the alternate version of a trait. c) the visible trait in the f1 generation. d) a section of dna that codes for a specific trait .

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.

How do plants obtain more sunlight a.) they lean towards the light b.)they grow straight up c.) they only live in sunny areas, like the tropics d.) they stay low to the ground