Speciation

Question 1

what is speciation?

Answer 1

the development of a new species from an existing species

Question 2

when does speciation occur

Answer 2

when populations of the same species become reproductively isolated - can no longer interbreed to produce fertile offspring

Question 3

what is allopatric speciation?

Answer 3

when a physical barrier divides a population of a species/geographical isolation

Question 4

what is sympatric speciation?

Answer 4

speciation that occurs when a population becomes reproductively isolated without any physical barriers.

Question 5

what happens in allopatric speciation?

Answer 5

• requires geographical isolation
  1. physical barrier
  2. populations adapt to the new environments
  Allele frequency changes = difference in genepools = changes in phenotype frequencies
  3. they become reproductively isolated = developed a new species

Question 6

What type of changes occur during reproductive isolation?`

Answer 6

seasonal - changes in flowering/mating
Mechanical - changes in genitalia prevent successful mating
behavioural - a group of individuals develop courtship rituals that aren’t attractive to the main population