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A technique for counting numerous chromosomes

✍ Scribed by Tze-Tuan Chen

Publisher
John Wiley and Sons
Year
1946
Tongue
English
Weight
224 KB
Volume
78
Category
Article
ISSN
0362-2525

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✦ Synopsis

Aiigclcs

ELEVEN FIGURES

F o r some years the writer has been studying ('lironiosomes iii Paramecium, especially those in P. bursaria. There were found in this species many polyploid races, each having nu- iiiei*ous chromosomes running up to several 11undred.l I n order to ascertain the number of chromosomes in each race, a method of counting them was devised. The writer believes this method might also be useful in studying other organisms having iiumerous chromosomes. The method consists essentially of the use of a special ocular disc in drawing chromosomes, with the drawings made on celluloid sheets.'

The ocular disc is made of optical glass, in the center of wliicli is a square ruled into a number of divisions. Ocular disc type I will be used as a n example. The 3-inn1 square is

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