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Gametes with two heterozygous copies of a chromosome may result from nondisjunction in either meiotic division.
What three types of nondisjunction are there?
Nondisjunction can take one of three different forms: failing to separate a homologous pair of chromosomes during meiosis I; failing to separate sister chromatids during meiosis II; or failing to separate sister chromatids during mitosis.
How can you tell whether nondisjunction takes place in meiosis 1 or 2?
- Nondisjunction, which can lead to an aberrant amount of chromosome-bearing gametes, can happen during meiosis I and meiosis II.
- The primary distinction between nondisjunction in meiosis 1 and 2 is that whereas sister chromatids fail to separate in meiosis II, homologous chromosomes fail to separate during meiosis 1.
What are mitotic and meiotic divisions?
- Mitosis and meiosis are the two distinct processes of cell division.
- When people talk about "cell division," they typically mean mitosis, which is the process of creating new cells for the body.
- The cell division process known as meiosis is what produces egg and sperm cells. A vital process for life is mitosis.
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