BIOLOGY 1M03 Lecture Notes - Lecture 10: Sympatric Speciation, Hybrid Zone, Polyploid
4 Feb 2018
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Hybrids could facilitate gene flow, or not. Practice question: based on this phylogeny, which of the following groups is not a clade: cow and sheep, pig and alpaca, elephant and manatee, armadillo, elephants, manatee. Autopolyploids, which are produced by spontaneous genome duplication within a species; occurs fairly frequently in plant. Allopolyploids, which result from genome duplication in association with hybridization of 2 different species. Maidenhair ferns include diploid (2n) and tetraploid (4n) populations. Tetraploids are the offspring of a parent that produced diploid gametes and then self fertilized. Tetraploid individuals can breed with other tetraploids but not with diploids. Allopolyploidy may occur after 2 species hybridize. Tetraploid species are generated and these can undergo polyploidization to generate. The more divergent you are, you will not have hybrids occurring at all. 2 diploid ancestors, each with 4 chromosomes (diploid number is 2). When the species undergoes meiosis, there is a reduction in chromosomes number (in gametogenesis).
