Prepare for the Clinical Genetics Test. Utilize flashcards and multiple-choice questions, each with hints and explanations. Achieve success on your exam!

Multiple Choice

During oogenesis, at what stage are oocytes suspended until sexual maturity?

In females, oogenesis starts before birth and the primary oocytes enter meiosis I but stay paused in prophase I for a long period, specifically at the diplotene stage. This arrest persists until puberty, after which hormonal cycles resume meiosis I in a select few oocytes each cycle. The first meiotic division is completed to form a secondary oocyte, which then arrest at metaphase II until fertilization. So the stage where oocytes are suspended until sexual maturity is prophase I. The other stages occur later in the process: prophase II would only happen after meiosis I is finished, and metaphase I or anaphase I are not the ongoing arrest point.

In females, oogenesis starts before birth and the primary oocytes enter meiosis I but stay paused in prophase I for a long period, specifically at the diplotene stage. This arrest persists until puberty, after which hormonal cycles resume meiosis I in a select few oocytes each cycle. The first meiotic division is completed to form a secondary oocyte, which then arrest at metaphase II until fertilization. So the stage where oocytes are suspended until sexual maturity is prophase I. The other stages occur later in the process: prophase II would only happen after meiosis I is finished, and metaphase I or anaphase I are not the ongoing arrest point.