Question

ii. Name one difference which has an environmental cause. iii. Name one difference which has both inherited and environmental causes ​

Answer 1

Answer:

A gene variant is a permanent change in the DNA sequence that makes up a gene. This type of genetic change used to be known as a gene mutation, but because changes in DNA do not always cause disease, it is thought that gene variant is a more accurate term. Variants can affect one or more DNA building blocks (nucleotides) in a gene.