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Questions and Answers
What characterizes inherited gene variants or mutations?
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?
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?
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?
How can a recessive gene variant influence phenotype expression?
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Which of the following best describes a somatic variant?
Which of the following best describes a somatic variant?
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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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