, Volume 15, Issue 5, pp 618-629

Size variation and orientation of the human Y chromosome

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Summary

The material consists of 84 metaphase plates from 17 individuals with clearly distinguishable Y chromosomes. The plates were obtained from leucocyte cultures. In making the preparations, exactly the same procedure was employed in all cases, including among other things, air-drying and light flaming.

It was found that the size of the Y chromosome is subject to interindividual variation. The size of the Y chromosome has been expressed in relation to the mean length of the other small acrocentric chromosomes. The chromosomes have been tentatively classified into the following main groups:1. Y/G = 1.8; 2. Y/G =1.5; 3. Y/G is somewhat larger than G or 1.1, and 4. Y/G equals the mean of the small acrocentric chromosomes, or Y/G = 1. In the long Y chromosome two secondary constrictions have been observed.

The location of the Y chromosome has been determined as peripheral or non-peripheral. The proband material has been divided into three main groups. The first comprises the individuals with a large Y chromosome (Y/G = 1.8). The second group includes individuals showing Down's syndrome and having 47 chromosomes, and the third comprises individuals with 46 chromosomes and possessing a Y/G sized 1 to 1.5. Preferential peripheral location of the Y chromosome has not been statistically verified in any one of these groups.