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Around 1
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Almost
every one of the 7
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Natural selection in the evolution of populations:

Genetic Diversity:

1
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Genetic similarities and differences between organisms may be defined in
terms of variation in DNA
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A population is
a group of individuals of the same species that
live in the same place and can interbreed
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The greater the number of different alleles that all
members of a species possess, the greater the genetic diversity of that species
...
The greater the genetic diversity, the more
likely that some individuals in a population will
survive an environmental change
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This
gives a greater probability that some individual will
possess a characteristic that suits it to the new environmental conditions
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Genetic diversity
and adaptation

Not all alleles of a population are equally likely to be passed to
the next generation
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mental conditions at any one time
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The process:

2
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The peppered moth normally has a light colour
that camouflages it against the light background of
within any population of a species there will be a gene the lichen covered trees on which it rests
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Manchester
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development
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4
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As a
result, they will have a better chance of breeding successfully and producing more offspring
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Only those individuals that reproduce successfully will
pass on their alleles to the next generation
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As these new individuals also have the new
‘advantageous’ allele, they in turn are more likely to survive = reproduce successfully
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Over many generations the number of individuals with the
new ‘advantageous’ allele will increase at the expense of
the individuals with the ‘less advantageous’ alleles
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Over time, the frequency of the new ‘advantageous’ allele
in the population increases while the ‘non-advantageous’
decreases
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