Hardy-Weinberg Principle - Study Notes

Patterns geographical separation populations inhabit

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: t different continents, islands, � Postmating Gametes mortality / sperm cannot reach or fertilize egg Zygote mortality / fertilisation occurs, but zygote fails to develop Hybrid sterility / hybrid survives (viable) but is sterile and cannot reproduce (no meiosis) Hybrid inviability / F1 hybrid has reduced viability: incomplete development Allopatric speciation (geographical isolation) Physical barrier (H2O, mountains, dessert) divides a population Two different environments (abiotic, biotic) Natural selection Genetic drift changes genotype and phenotype Two populations evolve separately Reproductively isolated / 2 distinct species Sympatric speciation (reproductive isolation) Genetic isolation by mutation / reproductively isolated / but inhibit same habitat Drift can cause further divergence between isolated gene pools Hybridisation in plants o Offspring produced from parents of two different species o Chromosomal number doubles / polyploidy o New species is reproductively isolated by a postmating mechanisms Can only reproduce with other polyploids, backcrosses with (2n) parents are sterile...
View Full Document

This document was uploaded on 02/28/2014 for the course BLG 144 at Ryerson.

Ask a homework question - tutors are online