Having more than one gene of each type means that if one gene of a set loses function, the plant still has another one that works. Scientists don't know why, but they believe having extra copies of genes may have imparted some stability to plants during a time of rapid climate change after an asteroid hit Earth. Duplications like this are known to have happened in other plant groups at this same time but haven't occurred since, Heslop-Harrison said.ฤก0 Contoh Soal Structure dalam Tes TOEFL Lengkap Beserta Jawaban dan Pembahasannya Oleh Ning Setiawati Diposting pada Januari 5, 2019. Two of the doublings took place at the Cretaceous-Tertiary boundary 65 million years ago, back when the dinosaurs and lots of other species went extinct, Heslop-Harrison noted. And, intriguingly, three times since this genus of giant herbs took an evolutionary turn away from its relatives - the grasses - it has duplicated its entire set of chromosomes. Program aspekte mittelstufe deutsch b2 pdf file.
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