LIFE SCIENCE

OBJECTIVE LIFE SCIENCE

GENETICS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A characteristic of mutations is that they usuallu
A
are caused only by the events of mitosis
B
do not occur at random
C
result in a different genetic sequences
D
occur to meet the needs of a species
Explanation: 

Detailed explanation-1: -Answer and Explanation: The answer is A, they result in different genetic sequences. By definition, a mutation causes a change in the DNA of an organism, meaning the genetic sequence is altered. They occur at random and can occur spontaneously, such as the mutations experienced in cancer.

Detailed explanation-2: -“Mutation refers to any change in the base sequence of DNA i.e. heritable change in the genome. The most common change is a substituion, addition, rearrangement, or a deletion of one or more bases. A mutation need not give rise to a mutant phenotype.”

Detailed explanation-3: -A mutation is a change in the DNA sequence of an organism. Mutations can result from errors in DNA replication during cell division, exposure to mutagens or a viral infection.

Detailed explanation-4: -For mutations to affect an organism’s descendants, they must: 1) occur in cells that produce the next generation, and 2) affect the hereditary material. Ultimately, the interplay between inherited mutations and environmental pressures generates diversity among species.

There is 1 question to complete.