Trace natural selection from heritable variation through differential survival and reproduction to changing allele frequencies across generations in Cambridge A Level Biology…
Natural selection occurs in populations, such as in populations of sea blush plants.
Explain why natural selection occurs in populations.
any five from:
1 (populations) can produce many offspring / AW ;
2 genetic variation occurs (in populations) / described ;
3 ref. mutations / sexual reproduction / gamete formation / random fertilisation ;
4 ref. competition qualified ;
e.g. mates / food / resources
5 ref. selection pressure ;
6 some individuals have advantageous, adaptations / phenotype / traits / AW ;
7 (so) they, survive / reproduce / have a selective advantage ;
8 (so) pass on their advantageous allele(s) ;
9 (so) the (advantageous) allele frequency increases ;