1936-08
AUTHORSMargaret Upcott
ABSTRACTThe 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). 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.Secondary pairing and the formation of an occasional quadrivalent show the parent species to be tetraploid. The hybrid must therefore be regarded as octoploid.4.Ae. planlierensis (2n = 60) is a hexaploid back-cross ofAe. carnea Ae. Hippocastanum, and forms varying numbers of multivalents, bivalents and univalents. The individuals ofAe. Hippocastanum andAe. carnea examined are heterozygous for inversions. 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). 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. Secondary pairing and the formation of an occasional quadrivalent show the parent species to be tetraploid. The hybrid must therefore be regarded as octoploid. 4.Ae. planlierensis (2n = 60) is a hexaploid back-cross ofAe. carnea Ae. Hippocastanum, and forms varying numbers of multivalents, bivalents and univalents. The individuals ofAe. Hippocastanum andAe. carnea examined are heterozygous for inversions. More... »
PAGES135
http://scigraph.springernature.com/pub.10.1007/bf03027607
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