Question

For each mutation described, classify it as a germ-line mutation or a somatic mutation
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A genetic disorder caused from a mutation is present in 1 of 4 offspring.
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A mutation occurs before fertilization
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A virus alters the DNA of an infected individual's body cells
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A mutation occurs in a group of skin cells in a developing embryo

Answer 1

A genetic disorder caused from a mutation is present in 1 of 4 offspring. — Germ-line mutation (present in gametes, heritable)

A mutation occurs before fertilization. — Germ-line mutation (affects egg or sperm/germ cells)

A virus alters the DNA of an infected individual's body cells. — Somatic mutation (affects body cells, not heritable)

A mutation occurs in a group of skin cells in a developing embryo. — Somatic mutation (restricted to somatic cell lineage, mosaic/nonheritable)