BIOL 115 Lecture Notes - Lecture 18: Gamete, Speciation, Epistasis
Document Summary
Species are metapopulations that exchange alleles frequently enough to comprise the same gene pool. Species are groups of interbreeding populations that are reproductively isolated from other such groups. Smallest possible group descending from a common ancestor and. Speciation involves barriers to reproduction recognized by unique, derived traits. But then something happens is a barrier to reproduction takes several forms. Formerly interbreeding pool, divides into two groups. Once the reproductive barrier emerges, two lineages on their own fits the species definition. Barrier is strong enough that the lineages are no longer interbreeding and. Geographic: extrinsic properties of landscape that prevent gene flow. Reproductive: features of organisms that prevent interbreeding. In the same land or same area. Even if they are in the same physical space, they work. However, they are functionally prevented from interbreeding since they"re on separate continents. Corals reproduce through releasing gametes into the water column.
