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. 2011 Aug 22;6(8):e23511. doi: 10.1371/journal.pone.0023511

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Yuan et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A: Most chromosomes are paired in a pollen-mother-cell of F₂ plant A-28-13-1; B: All the chromosomes were unpaired in a pollen-mother-cell of F₁ palnt A-28-13.