Results 211 to 220 of about 34,110 (232)

Male and female meiosis in grasshoppers

Chromosoma, 1974
Male meiosis in the grasshopper Stethophyma grossum is well known as an example of proximal chiasma localisation. An investigation of female meiosis in oocytes of this species shows that both the frequency and distribution of chiasmata are quite different from the male situation. Mean chiasma frequency per cell (14.98) in considerably higher in females
P E, Perry, G H, Jones
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Spontaneous univalence at male meiosis in the mouse

Cytogenetics and Cell Genetics, 2008
A single male mouse exhibiting almost total achiasmate meiosis with a concomitant increase in univalent frequency is reported. It was impossible to state whether this condition was caused by asynapsis or desynapsis. Histological examination of the testis showed an apparent block in spermatogenesis associated with a thickening of the tunica albugenica ...
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Cyclin A1 is required for meiosis in the male mouse

Nature Genetics, 1998
The mammalian A-type cyclin family consists of two members, cyclin A1 (encoded by Ccna1) and cyclin A2 (encoded by Ccna2). Cyclin A2 promotes both G1/S and G2/M transitions, and targeted deletion of Ccna2 in mouse is embryonic lethal3. Cyclin A1 is expressed in mice exclusively in the germ cell lineage and is expressed in humans at highest levels in ...
D, Liu, M M, Matzuk, W K, Sung, Q, Guo, P, Wang, D J, Wolgemuth   +5 more
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Meiosis in the male of Puto albicans (Coccoidea-Homoptera)

Chromosoma, 1968
Cytologically, Puto has proved more primitive than its taxonomic position would indicate. In the single previously described example (Hughes-Schrader, 1944), an uncomplicated inverted meiotic sequence was described for the males. The present example, P. albicans, showed a significantly more primitive inverted sequence.
S W, Brown, C, Cleveland
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Human male meiosis

1972
No abstract available.
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The XY bivalent in human male meiosis

Annals of Human Genetics, 1966
SummaryThe X Y bivalent could eady be recognized in diakinesis and first metaphase in air‐dried preparations. The X and Y were clearly separated in varying proportions of these cells but probably more often in cells in the later stages. No chiasma could be demonstrated with certainty between X and Y.
M, Hultén, J, Lindsten, P M, Ming, M, Fraccaro   +3 more
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The Immunocytogenetics of Human Male Meiosis

2007
Recently, several components of the mammalian meiotic recombination pathway have been identified and new immunofluorescence approaches to the analysis of human meiosis have been developed. This has made it possible to directly examine the dynamics of chromosome behavior in meiosis I spermatocytes and address previously intractable questions, such as ...
Daniel Topping, Petrice Brown, Terry Hassold   +2 more
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Study of the human male meiosis

Human Genetics, 1977
Results obtained from a meiotic study of 250 pachytene cells from four normal human males are presented. G-banding patterns for pachytene bivalents, obtained using trypsin treatment, are also presented; a comparative study between G-banding patterns of pachytene bivalents and G-banding patterns of mitotic chromosomes, and a study of chromomere counting
M L, De Torres, J A, Abrisqueta
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Meiosis in the Djungarian hamster

Chromosoma, 1970
A study of male meiosis has been carried out on air-dried testicular preparations from 10 adult Djungarian hamsters (Phodopus sungorus campbelli Th.). The general course of meiosis in this species seems to be similar to that in most of the mammals so far studied.
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Meiosis in Drosophila males

Chromosoma, 1994
Jeffrey G. Ault, Conly L. Rieder
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