Analyses of diplotene chiasma frequencies in mouse oocytes and spermatocytes in relation to ageing and sexual dimorphism

Autor:	G. Jagiello, J.S. Fang
Rok vydání:	1979
Předmět:	Male Age Factors Gestational Age Anatomy Biology Spermatozoa Chromosomes Chiasma Sexual dimorphism Andrology Meiosis Mice Sex Factors Spermatocytes Ageing Oocytes Genetics Animals Female Crossing Over Genetic Molecular Biology Genetics (clinical) Ovum
Zdroj:	Cytogenetic and Genome Research. 23:53-60
ISSN:	1424-859X 1424-8581
DOI:	10.1159/000131302
Popis:	Diplotene chiasma frequencies from “early” (day 16) fetal oocytes are significantly greater than the average from “late” (day 18) oocytes. A decrease in chiasma frequencies from both ages was found at diakinesis/MI in oocytes of young or old adult females, indicating a loss of chiasmata and/or terminalization. A greater number of type I univalents was found in “late” oocytes than “early” oocytes entering diplotene. No differences were found in chiasma frequencies of male diplotene spermatocytes studied at 23 days, 2 months, or 24 months of age. A greater chiasma frequency was generally found in the female than the male at all ages studied.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::59807b0335f450024a61cd976c8acc83 https://doi.org/10.1159/000131302 Zobrazit plný text záznamu