THREE DIPLOID CHROMOSOME NUMBERS OF MAN
Open Access
- 15 March 1957
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 43 (3) , 285-292
- https://doi.org/10.1073/pnas.43.3.285
Abstract
The metaphase chromosomes of the spermatogonia and 1st spermatocytes were studied in 20 testes of Japanese. In 16 of these the chromosome number was 48 in the spermatogonia and 24 (bivalents) in the 1st spermatocytes, whereas, in the remaining 4, the number was 46 in the former tissue and 23 (bivalents) in the latter. Thus 2 diploid numbers were found to exist in man. A comparison of the chromosomes of 1st metaphases of the 46-and 48-chromosome types suggests that a pair of simple supernumerary chromosomes of very small size is present in the latter type and absent in the former. This presumed supernumerary was expected to occur singly in some Japanese. They should have 47 chromosomes in the spermatogonia and 1 univalent in addition to 23 bivalents in 1st spermato-cyte metaphases. A testis was obtained in which 47 spermatogonial chromosomes were counted with certainty.This publication has 2 references indexed in Scilit:
- THE CHROMOSOME NUMBER OF MANHereditas, 1956
- The sex chromosomes in man, with special reference to the first spermatocyteThe Anatomical Record, 1936