What conditions are needed for evolution by natural selection to arise?
Evolution by natural selection arises when these three properties are present in a system
-
Heredity - offspring resemble their parents in discrete characteristics.
-
Variation - there are heritable differences between individuals in the population.
-
Limited resources / overproduction - the presence of more offspring than the resources need to support them produces differential survival and selection pressure.
RA
Related Biology A Level answers
All answers ▸How is tissue fluid formed and returned to the circulatory system?
Describe the primary, secondary, tertiary and quaternary structure of proteins.
Each amino acid contains a different R group specific to the amino acid. Describe how the R group of an amino acid contributes to the tertiary structure of a protein. (4 marks)
With the aid of a diagram describe the events occurring in the neurone leading to the establishment of an action potential