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

2564 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

What is natural selection?


Explain how hydrogen bonding occurs between molecules of water.


What is meant by the term enzyme specificity?


Describe the differences in cell structure between animal, plant and bacterial cells


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