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Genetic Variants Overview

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Questions and Answers

What characterizes inherited gene variants or mutations?

They can only be expressed if the individual is homozygous for the trait.

They result from errors during DNA replication in somatic cells.

They can be present from birth and passed from parent to child. (correct)

They occur during an individual's lifetime due to environmental factors.

Which statement is true regarding non-inherited gene variants?

They can be passed to the next generation if they occur in germ cells.

They are always expressed phenotypically regardless of the gene type.

They cannot be passed to children and occur in somatic cells. (correct)

They result from inherited mutations that manifest later in life.

What environmental factor can cause non-inherited gene variants?

Exposure to UV radiation from the sun. (correct)

A viral infection during childhood.

Genetic drift over several generations.

Inherited recessive traits from ancestors.

How can a recessive gene variant influence phenotype expression?

<p>The phenotype can be expressed in individuals with a dominant allele.</p> Signup and view all the answers

Which of the following best describes a somatic variant?

<p>A variant that occurs after fertilization and affects somatic cells.</p> Signup and view all the answers

Study Notes

Genetic Variants

Genetic variants can be inherited or occur spontaneously.
Inherited variants are passed from a parent to their offspring.
Individuals may be carriers of a variant gene but not express the associated phenotype if the variant is recessive.
Non-inherited variants, also known as somatic variants, occur in somatic cells during an individual's lifetime.
Somatic variants cannot be passed down to offspring.
Environmental factors, such as exposure to radiation (X-rays or UV light), can contribute to non-inherited variants.
Errors during DNA replication during cell division can also lead to non-inherited variants.

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Description

Explore the fascinating world of genetic variants, including inherited and non-inherited types. Understand how these variants can affect phenotypes and the role of environmental factors in their occurrence. This quiz covers essential concepts related to genetics and DNA variations.