Lecture Notes June 29

Lecture Notes June 29 - Isolation and genetic divergence...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Isolation and genetic divergence leads to new species through allopatric speciation Anagenesis – one species evolving into another species Cladogenesis- one ancestor gives rise to multiple species ( note, ancestor isn’t a separate species) Sympatric speciation- speciation with out geographic isolation - temporal isolation - behavioral isolation - misco habitat differences - disruptive selection - hard to document at times - genetic isolation overwhelms gene flow Polyploid- special sympatric speciation - creates a prezygotic barrier- reproductive barrier and reproductive divergence - can however self fertilize - autoploidy- mutation cause chromosome doubling o one species another species (2N to 4N mutation in meiosis) - alloploidy- 2 species mate and produce a zygote o mutation occurs and doubles the chromosomes (to 4N) o must be closely related o more common in plants more likely to self fertilize germ (gamete producing tissues) formed from more types of tissue When Populations Reconnect
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Lecture Notes June 29 - Isolation and genetic divergence...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online