Final answer:
Mutations in the DNA sequence can lead to melanoma and Huntington's disease. Melanoma is a type of skin cancer caused by mutations in skin cell growth genes, while Huntington's disease is caused by a mutation in the HTT gene, leading to nerve cell degeneration in the brain.
Step-by-step explanation:
Mutations in the DNA sequence can lead to melanoma and Huntington's disease. Melanoma is a type of skin cancer that is caused by mutations in the genes that control the growth and division of skin cells. These mutations can be caused by exposure to UV radiation from the sun or other environmental factors. Huntington's disease, on the other hand, is caused by a mutation in the huntingtin (HTT) gene, which codes for a protein involved in brain function. This mutation leads to the progressive degeneration of nerve cells in the brain.