LIFE SCIENCE

OBJECTIVE LIFE SCIENCE

MOLECULAR BIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Mutations usually ____
A
Are helpful
B
Are harmful
C
Are awesome
D
happen spontaneously
Explanation: 

Detailed explanation-1: -Most mutations are not harmful, but some can be. A harmful mutation can result in a genetic disorder or even cancer. Another kind of mutation is a chromosomal mutation. Chromosomes, located in the cell nucleus, are tiny threadlike structures that carry genes.

Detailed explanation-2: -In humans, it is estimated that there are about 30 mutations per individual per generation, thus three in the functional part of the DNA. This implies that on the average there are about 3/2000 beneficial mutations per individual per generation and about 1.5 harmful mutations.

Detailed explanation-3: -Sometimes, gene variants (also known as mutations) prevent one or more proteins from working properly. By changing a gene’s instructions for making a protein, a variant can cause a protein to malfunction or to not be produced at all.

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