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Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
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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
...
Genetic similarities and differences between organisms may be defined in
terms of variation in DNA
...
A population is
a group of individuals of the same species that
live in the same place and can interbreed
...
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
...
This
gives a greater probability that some individual will
possess a characteristic that suits it to the new environmental conditions
...
Genetic diversity
and adaptation
Not all alleles of a population are equally likely to be passed to
the next generation
...
mental conditions at any one time
...
The process:
2
...
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
...
Manchester
...
development
...
4
...
As a
result, they will have a better chance of breeding successfully and producing more offspring
...
Only those individuals that reproduce successfully will
pass on their alleles to the next generation
...
As these new individuals also have the new
‘advantageous’ allele, they in turn are more likely to survive = reproduce successfully
...
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
...
Over time, the frequency of the new ‘advantageous’ allele
in the population increases while the ‘non-advantageous’
decreases
...
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.