A variation in a single nucleotide of a DNA strand is called a(n) ____.
a. RNA switch
b. thymine substitution
c. environmental mutation
d. single nucleotide polymorphism
e. replication failure
Question 2
The area of study that examines how environmental factors influence gene expression without changing the DNA is known as ____.
a. genetics
b. genomics
c. nutritional genomics
d. epigenetics
e. nutrigenetics