Analyses of diplotene chiasma frequencies in mouse oocytes and spermatocytes in relation to ageing and sexual dimorphism - PubMed (original) (raw)

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

G Jagiello et al. Cytogenet Cell Genet. 1979.

Abstract

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 adults 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 difference 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.

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