Down Syndrome (trisomy 21) is caused by an error in meiosis which results in the presence of three chromosome #21s in the individual affected. In what two phases of meiosis could this error occur and, in general, HOW does it occur? 2. You are exploring a new planet when you discover a hexaploid (6n) organism. What is the ploidy of the gametes of wheat after meiosis and cytokinesis (what does 6n become)? 3. If a somatic cell has a diploid number of 4, what would be the result in the final daughter cells after cytokinesis IF in Anaphase, one of the chromosomes did not have a separation of sister chromatids? That is, if the sister chromatids of ONE of the chromosomes stayed together, what would be the chromosome number of each daughter cell?
Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
1. Down Syndrome (trisomy 21) is caused by an error in meiosis which results in the presence of three chromosome #21s in the individual affected. In what two phases of meiosis could this error occur and, in general, HOW does it occur?
2. You are exploring a new planet when you discover a hexaploid (6n) organism. What is the ploidy of the gametes of wheat after meiosis and cytokinesis (what does 6n become)?
3. If a somatic cell has a diploid number of 4, what would be the result in the final daughter cells after cytokinesis IF in Anaphase, one of the chromosomes did not have a separation of sister chromatids? That is, if the sister chromatids of ONE of the chromosomes stayed together, what would be the chromosome number of each daughter cell?
- What problems might be caused by this happening?
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