Topic 10.3: Gene Pools and Speciation
- Gene pools change over time.
Nature of science:
- Looking for patterns, trends and discrepancies—patterns of chromosome number in some genera can be explained by speciation due to polyploidy. (3.1)
10.3 U 1 A gene pool consists of all the genes and their different alleles, present in an interbreeding population.
10.2 U 2 Evolution requires that allele frequencies change with time in populations.
10.3 U 3 Reproductive isolation of populations can be temporal, behavioural or geographic.
10.3 U 4 Speciation due to divergence of isolated populations can be gradual.
10.3 U 5 Speciation can occur abruptly.
10.3 A 1 Identifying examples of directional, stabilizing and disruptive selection
10.3 A 2 Speciation in the genus Allium by polyploidy.
10.3 S 1 Comparison of allele frequencies of geographically isolated populations.
In the News
In the News
- Punctuated equilibrium was long considered an alternative theory of evolution and a challenge to the long established paradigm of Darwinian gradualism. How do paradigm shifts proceed in science and what factors are involved in their success?
Alex Lee discusses Topic 10.3