What is the difference beween biological species concept and the phylogentic approach to defining species?

 

The biological species concept classifies species as a group of actually or potentially interbreeding individuals. This means that any two individuals (well a male and female) within the group could breed and produce fertile offspring.     This is definition  is commonly used but there are some issues with it, and situations it can't be used in.      1) Not all species sexually reproduce      2) It can't be applied to the fossil record                The phylogenetic approach is now commonly used instead of the above, especially with increased knowledge of genetics. By comparing DNA sequences it can be found which individuals have a common ancestor (an organism the whole group evolved from). This (monophyletic) group can be classed as a species. This species classification system is better as it     1) can be applied  to asexual organisms          2) Can be used for extinct species if DNA is available       3) No need to test the population to see if they can interbreed as this can be very difficult   4) However it is subjective - the scientist has to decide how recent a common ancestor to use (as all individuals have a common ancestor at some point in evolution). Usually the most recent common ancestor of a population, that can be distinguished from other populations, is used.

HH
Answered by Harriet H. Biology tutor

24122 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Describe the changes in the lungs during inspiration


What is negative feedback?


Describe the structure of a protein


What is the significance of performing mouth-to-mouth breaths during CPR?


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