Suggest how the two sub-species have developed from a single ancestral population.

Two populations become separated by a barrier such as sea (geographical separation). As a result populations cannot interbreed, hence gene flow between two populations is prevented. As a consequence, only a small number of species are breeding (the founder effect) leading to a limited variety of allels. Gene mutations take place; there are different environmental conditions and selection pressures leading to changes in the allele frequency. This leads to physical and physiological changes and hence allopatric (geographic) speciation.

Answered by Maja S. Biology tutor

2280 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Why do chemical impulses only go in one direction across a synapse?


Not all mutations result in a change to the amino acid sequence of the encoded polypeptide. Give an explanation.


How does DNA replication work?


Describe evolution by natural selection and how this may lead to speciation?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences