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what is a polyploid organism
organism that has more than two sets of homologous chromosomes
what is polyploidy
whole genome duplication
chromosomes in a cell are duplicated but the cell doesn’t divide
how many sets of chromsomes does a haploid, diploid, triploid and tetraploid have?
1 set, 2 sets, 3 sets, 4 sets
what is whole genome duplication in a diploid cell called
autotetraploid (non-hybrid)
what is allopolyploidy?
special case of polyploidy
allopolyploid = hybrid and has multiple chromosome sets derived from the different parental species
how can more allotetraploid cells be produced?
through mitosis
can also divide by meiosis because there are two homologous chromosomes of each type to form pairs
who can allotetraploids interbreed with?
other allotetraploids - cannot interbreed with parent species
why are allotetraploids a new species?
cannot breed with parent species
what is an example of a species that has arisen from hybridisation followed by polyploidy?
periscaria
100+ species of this genus, 15 orginiating by allopolyploidy
Note 
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