Summary
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1.
The somatic chromosomes ofAesculus Hippocastanum (2n = 40) and ofAe. Pavia (2n = 40) are exactly similar in size and shape, although each complement contains within it differences which are also distinguishable in the complement of the hybridAe. carnea (2n = 80).
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2.
In both species, and in the hybrid, polar views of metaphase I show about half the bivalents larger than the rest, and this is due to their having chiasmata in both arms. This difference necessarily disappears at anaphase.
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3.
Secondary pairing and the formation of an occasional quadrivalent show the parent species to be tetraploid. The hybrid must therefore be regarded as octoploid.
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3a.
4.Ae. planlierensis (2n = 60) is a hexaploid back-cross ofAe. carnea Ae. Hippocastanum, and forms varying numbers of multivalents, bivalents and univalents.
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5.
The individuals ofAe. Hippocastanum andAe. carnea examined are heterozygous for inversions.
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Upcott, M. The parents and progeny of aesculus carnea. Journ. of Genetics 33, 135–149 (1936). https://doi.org/10.1007/BF03027607
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DOI: https://doi.org/10.1007/BF03027607