HEREDITY
MUTATIONS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
a gene that has an altered mutation
|
|
|
something that causes a mutation
|
|
|
any change in a nucleotide sequence of DNA
|
|
|
the portion of the chromosome altered by the mutation
|
Detailed explanation-1: -(MYOO-tuh-jen) Anything that causes a mutation (a change in the DNA of a cell). DNA changes caused by mutagens may harm cells and cause certain diseases, such as cancer. Examples of mutagens include radioactive substances, x-rays, ultraviolet radiation, and certain chemicals.
Detailed explanation-2: -A mutagen is a substance or agent that causes DNA impairment that results in the alteration of the DNA sequence. This alteration of the DNA sequence is known as mutation. Any agent causing mutation is called mutagen. Mutagens can be physical mutagens, chemical mutagens, or biological mutagens.
Detailed explanation-3: -Mutations can result from errors in DNA replication during cell division, exposure to mutagens or a viral infection. Germline mutations (that occur in eggs and sperm) can be passed on to offspring, while somatic mutations (that occur in body cells) are not passed on.
Detailed explanation-4: -Mutagens are substances that alter or change the genetic material of an organism, hence they are termed genotoxic. In most cases, the mutagens can incite carcinogenic responses or impair the functions of certain genes. Or they can completely ride a gene of its functionality, thereby causing various medical conditions.
Detailed explanation-5: -Mutagens – Physical, Chemical and Biological Mutagenic Agents.