GENETICS AND EVOLUTION
EVOLUTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
adaptation
|
|
|
natural selection
|
|
|
bacteria
|
|
|
mutation
|
Detailed explanation-1: -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.
Detailed explanation-2: -Listen to pronunciation. (myoo-TAY-shun) Any change in the DNA sequence of a cell. Mutations may be caused by mistakes during cell division, or they may be caused by exposure to DNA-damaging agents in the environment.
Detailed explanation-3: -What is a mutation? If there is a change or “misspelling” in the nucleotide letter sequence of a gene, the protein may not be made or may not work properly. This misspelling of a gene is what we call a mutation (Figure 2). The entire collection of DNA in each cell is called the genome.