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#chromosome number

9 public questions tagged with this topic.

Plant Breeding 4

Hexaploid wheat has chromosome number:

Common bread wheat Triticum aestivum is an allohexaploid that arose through two successive natural hybridizations followed by spontaneous chromosome doubling. First hybridization between einkorn relative Triticum urartu carrying AA genome 2n=14 and Aegilops speltoides related BB genome 2n=14 produced tetraploid wild emmer AABB 2n=28. Second hybridization of tetraploid emmer with diploid goat grass Aegilops tauschii DD genome 2n=14 and subsequent doubling yielded hexaploid ABD genome complement with basic chromosome number x=7. Therefore 6x = 42 chromosomes in somatic cells, 21 pairs, with 7 ch

Ref: Sears ER. Wheat cytogenetics; International Wheat Genome Sequencing Consortium 2018 Science 2n=42

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Basics of Inheritance

Monoploid organisms contain

Monoploid organisms contain single complete chromosome set, symbol n, representing basic genome. Naturally monoploid states include prokaryotes, gametes of diploids, some fungi and lower plants. They express every allele without masking by dominance, facilitating mutational screens and genetic analysis. Two sets define diploid 2n, three triploid, four tetraploid. Monoploid terminology overlaps haploid, which references reduced gametic number relative to somatic diploid. Understanding monoploidy clarifies ploidy cycles, life cycles and origin of alternation of generations in plants. Cytological

Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 3: Ploidy, Monoploid

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