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Researchers who study families of extreme early-risers show that many of them share the same mutation on one of these clock genes, and studies have found similar mutations in hamsters with early chronotypes.
Original Video：
Late sleeper? Blame your genes.
Key Vocabulary
1. extreme very large in amount or degree
extreme
[ɪkˈstriːm] (adj.) very large in amount or degree
2. mutation the way in which genes change and produce permanent differences
mutation
[mjuːˈteɪʃn] (n.) the way in which genes change and produce permanent differences
3. gene a part of the DNA in a cell that controls the physical development, behaviour, etc. of an individual plant or animal and is passed on from its parents
gene
[dʒiːn] (n.) a part of the DNA in a cell that controls the physical development, behaviour, etc. of an individual plant or animal and is passed on from its parents
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