Predict how an extreme climate change might affect natural selection in species with

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lets say we're talking about mice.
T - Dominant for thin fur
t - recessive for thick fur

If the climate got much colder, there is a better chance of the (tt) thick fur individuals surviving and reproducing. So you would see lower levels of (TT) and (Tt) individuals and a rise of (tt) individuals
 
little genetic variation? Predict how an extreme climate change might affect natural selection in a species with little genetic variation

thankss<3
 
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