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| Description: Two salt grass species, Spartina maritima (2n = 60) and Spartina alterniflora (2n = 62) produced an interspecific hybrid (2n = 61) that subsequently doubled its chromosome number by nondisjunction to produce the new salt grass species Spartina anglica, an allotetraploid (4n = 122)Two salt grass species, Spartina maritima (2n = 60) and Spartina alterniflora (2n = 62) produced an interspecific hybrid (2n = 61) that subsequently doubled its chromosome number by nondisjunction to produce the new salt grass species Spartina anglica, an allotetraploid (4n = 122) Spartina Spartina alterniflora maritima \ Meiosis Meiosis l l i V =3?‘ Gametes ‘ I, \L. \-_ Gamete union lnterspecific _ lnterspecific hybrid is infertile hybrid due to nonhomology of chromosomes. l Chromosome doubling by nondisjuction New species: is 51+2n _12\2\ Homologous chromosome 7 Spartina anglica ' s 2" pairing and disjunction. } The new species is fertile l and can reproduce. Picture Stats: Views: 98 Filesize: 441.34kB Height: 1962 Width: 1266 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=48855 |