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 ▸Using knowledge of the pathogenicity of HIV, explain why it can't be transmitted through inanimate objects or hand shakes with an infected person.
Outline the roles of synapses in the nervous system
Describe the stages of transcription
How does the structure of DNA make it an effective carrier of genetic information?