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Effect of x-rays on the somatic chromosomes of the exotic fish,Tilapia mossambica
Male and female T. mossambica were x-rayed with 100 r and the meta-phase chromosome aberrations in their gill epithelia were studied and the chromosomes of males appeared more radiosensitive than those of females.
Meiosis in two Species of Parabolocratus with Polymorphic Sex Chromosomes in Males of P. Albomaculatus (Homoptera)
Gonial chromosomes in two species of Parabolocratus have been investigated and the relative percentage volume of the primary spermatocyte metaphase chromosomes were determined.
Chromosome analysis in three species of fishes belonging to family Gobiidae.
Ch Chromosomal evolution and interrelationships in the three species have been discussed and the role of pericentric inversion in bringing the morphological differences in the caryotype has been stressed.
Studies of Gryllid Chromosomes
Since 309 out of 417 males examined are heterozygous (about 74%), the heterozygotes are likely to enjoy a selective advantage and the species is under genetical fixation.
Chromosome Number of Human Endometrium
- G. Manna
- 6 February 1954
An extensive study on the variations of the chromosome number in the human endometrium in the proliferative stage finds that the highest frequency distribution is between 21 and 25 chromosomes.
High Frequency of Chromatid Breaks in Two In vitro Cell Populations
Using his medium formula 5 a, McCoy succeeded in establishing two mutant cell lines, JA-1 and JA-2, which did not require asparagine, which like the populations of the Novikoff hepatoma cell lines displayed various combinations of their marker chromosomes so that the populations were highly polymorphic.
Differential maleic hydrazide (MH) sensitivity shown by the spermatocyte chromosomes in five species of grasshoppers.
The relative effect of maleic hydrazide, administered at the rate of 5 mg per individual, on the spermatocyte chromosomes of five species of grasshoppers has been studied and the differential responses have been critically analysed in various ways.
CHROMOSOMES OF BONE MARROW CELLS OF THE INDIAN HOUSE SHREW, SUNCUS MURINUS
Cytologically, apart from the monomorphic species stated before, the family Soricidae includes the highly interesting polymorphic species, Sorex araneus, which has been found to be cytologically monomorphic with relatively high diploid numbers.