Further Studies on Sex Chromatin of the Opossum Didelphis paraguayensis (Marsupialia)

Autor:	Lia C. Steyer, Jorge Paulete-Vanrell
Rok vydání:	1970
Předmět:	Genetics Didelphis biology Barr body Chromosome Zoology Cell Biology Plant Science Y chromosome biology.organism_classification Sex chromatin Prophase Opossum Animal Science and Zoology X chromosome
Zdroj:	CYTOLOGIA. 35:434-443
ISSN:	1348-7019 0011-4545
DOI:	10.1508/cytologia.35.434
Popis:	The authors report the sex chromatin analysis carried out in the opossum Didelphis paraguayensis Oken 1816. Animals of both sexes possess distinct chromocenters or sexual vesicles in interphase nuclei and even an heteropycnotic chromosome during prophase. These findings are more evident in females than in males, which is interpreted on the basis of size differences of sex chromosomes between both sexes. It is concluded that for Didelphis paraguayensis the sex chromatin is formed by a condensed X chromosome in females, and for an allocyclic part or even the whole Y chromosome in the males. The different frequencies of Barr bodies and drumsticks between males and females are significant, after various statistical tests, which allows their use to achieve the diagnosis between sexes.
Databáze:	OpenAIRE
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