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In the plant genus Triticum there are many different polyploid species

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In the plant genus Triticum there are many different polyploid species, as well as;diploid species. Crosses were made between three different species, and hybrids;were obtained. The meiotic pairing was observed in each hybrid, and this is recorded;in the following table. (A bivalent is two homologous chromosomes paired at;meiosis, and a univalent is an unpaired chromosome at meiosis.);Species crossed to make hybrid;Pairing in hybrid;1. T. turdigum ? T. monococcum 7 bivalents + 7 univalents;2. T. aestivum ? T. monococcum 7 bivalents + 14 univalents;3. T. aestivum ? T. turdigum 14 bivalents + 7 univalents;Explain these results and, in doing so;a) deduce the somatic chromosome number of each species used.;b) state which species are polyploid and whether they are autopolyploids or allopolyploids.;c) account for the chromosome pairing pattern in the three hybrids.

 

Paper#16325 | Written in 18-Jul-2015

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