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STUDY ON SEX CHROMATIN OF MAMALS

߾ 1964 7 3ȣ p.371 ~ 375
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Abstract


By using biebrich scarlet - fast green method which was initiated by Hormez R. Guard, the author made an extensive study on sex chromatin of the smears obtained from the oral and vaginal mucosa of sexually healthy human beings, domestic mammals such as rabbits, cats, dogs, goats, pigs, and albino rats. The results are summarized as follows;
1. The percentage of positive appearance of sex chromatin in the epithelial cells of the oral mucosa of human beings ranged in females from 36 to 71%, in males from 0 to 19%, with an average being 54.2% in females, 6% in males, repectively. However, in dogs sex chromatin was identified in 25 to 47 % of female dogs (average 38%) whereas it was about 7 to 17% in male dogs (average 15%), In pigs the incidence of sex chromatin identification was 21 to 33% in females(average 30.7)% and in males 3 to 9% (average 6%), Consequently, it has been revealed that the incidence of sex chromatin varied considerably with sex. But in the case of such animals as cats, rabbits, and goats, it seemed rather very low in both sexes, and also it. was shown to be not affected by sex, although sexual difference was considerably noted in the case of human beings, dogs and pigs.
Therefore, it follows that oral mucosa were found to be a favourable site for determination of genetic sex in human beings as well as dogs and pigs, but that they were not always proper for sex determination in other animals such as cats, rats, rabbits, and goats.
2. The percentage of positive appearance of sex chromatin in the epithelial cells of the vaginal mucosa was 94.5% in human beings, 93.7% in cats, 87.2% in dogs, 84.4% in goats, 74.3% in pigs, 63% in rabbits, 60.3% in rats. Positive appearance of sex chromatin in the epithelial cells of the vaginal mucosa showed a higher percentage than that of the oral mucosa.
3. So far as various forms of sex chromatin distribution in the oral mucosa are concerned, submarginal type was the most frequent, with marginal type and bipartite type and bipartite type following in order, the vaginal mucosa of human beings. and goats showed, for the most part, a high incidence of marginal type with submarginal and bipartite type being next in order of incidence. But in the case of dogs, cats, rats, rabbits, and pigs, submarginal type was the most frequent, next in order of frequence were marginal and bipartite type.
4. No marginal types could be demonstrated in the sex of male of both human beings and animals.

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