Explain how evolution by natural selection brings about changes in a species ?

Variation is present in a population, this can either be genetic variation or due to mutations. A selectional pressure causes a stuggle for existance. Selectional pressures can come from a predator, disease or increased competition for resources such as a mate, food and shelter. Indaviduals with advantagous characteristics are more likely to survive and reproduce passing on the advantageous trait to their offspring. Gradually over time most of the population possess the advantageous trait.

MS
Answered by Martina S. Biology tutor

2560 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

How does a synapse work?


What changes occur in the body when you are too hot? (5 marks)


What are the 3 main factors affecting the rate of photosynthesis?


Describe why organisms may become extinct due to a change in the climate


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences