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P. C. Koller
Articles written in Journal of Genetics
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Volume 32 Issue 1 February 1936 pp 79-102
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Volume 32 Issue 3 July 1936 pp 451-472
The genetical and mechanical properties of the sex-chromosomes - II. Marsupials
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Volume 36 Issue 2 July 1938 pp 177-195
The genetical and mechanical properties of the sex-chromosomes - IV. The golden hamster
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Volume 36 Issue 2 July 1938 pp 275-306
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Volume 38 Issue 3 September 1939 pp 477-492
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Volume 41 Issue 2-3 January 1941 pp 375-389
1. The diploid chromosome number in the spermatogonia of
Apodemus sylvaticus andA. hebridensis is 48.2. The sex chromosomes are unequal in size; the
X is the largest chromosome in the complement, theY is the smallest. TheY chromosome is smaller inA. hebridensis than inA. sylvaticus .3. The sex bivalent shows a uniform symmetrical configuration during meiotic metaphase in both species.
4. In
A. hebridensis post-reduction is obligatory, theX andY segregate at the second meiotic anaphase. InA. sylvaticus 8% of the primary spermatocytes show pre-reduction, and 92% post-reduction, of theX andY .5. The behaviour of the
X - andY -chromosomes ofA. sylvaticus during meiosis suggests that the pairing segment is composed of a distal and a proximal region, i.e. that the centromere is located interstitially and chiasmata can be formed on either side of it.6. In
A. hebridensis the behaviour of theXY bivalent suggests that the distal pairing segment is either entirely absent or is too small for chiasma to have formed, and hence segregation of theX andY is always post-reductional. -
Volume 44 Issue 1 September 1942 pp 53-72
X-ray-induced structural changes in the chromosomes of
Drosophila pseudo-obscura
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Journal of Genetics
Volume 102, 2023
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Journal of Genetics | News
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Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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