BIOL 1020H Chapter Notes - Chapter 22: Chromosome, Main Source, Genetic Drift
Document Summary
The ability to exchange genetic material by reproducing can only be done between members of the same species: mutations spread within species. Species represent a closed gene pool, where alleles are being share among members of that species. If a hybrid offspring is infertile, it is a genetic dead end: eg. The morphospecies concept is used instead of bsc on a daily basis: using morphology/ appearance to predict if they are of the same species, morphospecies concept is not accurate as some animals may look different, polymorphism. Cryptic species: species that were traditionally part of a species, but with dna, are not. Some plants can exchange genes with other species through hybridization: hybridization: interbreeding between two varieties, natural selection mush work against the hybrid offspring. 22. 2 reproductive isolation (pg. 449-450: reproductive isolation is divided into two categories, pre-zygotic, post-zygotic. Post-zygotic factors result in the failure of the fertilized egg to develop into a fertile individual.
