THE MOLECULAR BASIS OF INHERITANCE
GENE MUTATION
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sunlight
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Food
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Genes
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Allele
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Detailed explanation-1: -Ultraviolet (UV) light induces specific mutations in the cellular and skin genome such as UV-signature and triplet mutations, the mechanism of which has been thought to involve translesion DNA synthesis (TLS) over UV-induced DNA base damage.
Detailed explanation-2: -UVA (and also UVB) radiation cause indirect damage to DNA via absorption of photons by non-DNA chromophores. This generates reactive oxygen species like singlet oxygen or hydrogen peroxide that oxidize the DNA bases causing mutations.
Detailed explanation-3: -The routine and often unavoidable exposure to solar ultraviolet (UV) radiation makes it one of the most significant environmental DNA-damaging agents to which humans are exposed. Sunlight, specifically UVB and UVA, triggers various types of DNA damage.
Detailed explanation-4: -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-5: -Mutagens are also present in the environment and include sunlight and a multitude of chemicals that may be ingested in the foods that we eat or in the air that we breathe. Mutagens that promote the development of cancer are called carcinogens.