Tendency towards clonality: deviations of meiosis in parthenogenetic Caucasian rock lizards†.

ABSTRACT: Cytogenetic mechanisms of unisexuality in diploid parthenogenetic species of the genus Darevskia have remained debatable until recently. The mechanism that allows the unisexual form to maintain heterozygosity in a number of generations is important for its long-term existence in nature. In this work, for the first time, for parthenogenetic species of the genus Darevskia, in addition to primary oocytes with the usual ploidy (18 + ZW bivalents in meiotic prophase I), oocytes that underwent premeiotic genome endoduplication and carried a doubled number of bivalents (36 + ZZ + WW) were found. Here, we present a detailed comparative analysis of the preparations of synaptonemal complexes in oocyte nuclei without and with genome endoduplication and the behavior of sex Z and W chromosomes. We show

SUBMITTER: Spangenberg V 

PROVIDER: S-EPMC12358248 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature