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Parental chromosome dimensions in Ascaris. A study of the effect of cellular environment on chromosome size

✍ Scribed by Robert T. Hance

Publisher
John Wiley and Sons
Year
1927
Tongue
English
Weight
442 KB
Volume
44
Category
Article
ISSN
0362-2525

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✦ Synopsis

Abstract

In the early cleavage stages of Ascaris the homologous chromosomes are of unequal length. Measurements show that these homologues fall into two sharply defined groups suggesting their biparental origin. The shorter are considered to have come from the male.

As the age of the embryo increases, these differences between the chromosome mates tend to become less, and it is suggested that at some later period in the history of the animal this difference will entirely disappear in response to the effect of continued existence in a common environment. The length of the chromosomes is very slightly shortened during the early cleavage divisions, while the area of the equatorial cross‐section of the cells becomes enormously reduced.

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