How do diploid oogonia contribute to the number of germ cells before birth?
Understand the Problem
The question is asking about the role of diploid oogonia in the development of germ cells before birth, specifically how they contribute to their quantity. The options suggest different processes that might occur, like differentiation, mitosis, meiosis, or remaining unchanged.
Answer
Diploid oogonia increase germ cell numbers before birth through mitotic proliferation.
Diploid oogonia contribute to the number of germ cells before birth by undergoing mitotic proliferation. This increases their number significantly, resulting in millions of oogonia within the fetal ovaries before birth.
Answer for screen readers
Diploid oogonia contribute to the number of germ cells before birth by undergoing mitotic proliferation. This increases their number significantly, resulting in millions of oogonia within the fetal ovaries before birth.
More Information
During fetal development, the mitotic division of diploid oogonia not only increases their number but also paves the way for some of them to begin meiosis and transform into primary oocytes, which are arrested at prophase I until ovulation occurs later in life.
Tips
One common mistake is confusing the process of mitosis, which increases the number of germ cells, with meiosis, which reduces the chromosome number.
Sources
- Genetics, Female Gametogenesis - StatPearls - NCBI Bookshelf - ncbi.nlm.nih.gov
- Oogonium - Wikipedia - en.wikipedia.org
- Oogenesis and follicular development review (article) - Khan Academy - khanacademy.org
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