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Meiosis ?s
Meiosis q&a biology101
| Question | Answer |
|---|---|
| Is the process of DNA replication different in meiosis versus mitosis? | DNA replication occurs through the same mechanisms in both meiosis and mitosis. After replication, a maternal homologue and its copy, or sister chromatid become closely associated. The same thing happens with the original paternal homologue. |
| What is the purpose of the genetic reassortment, or cross-over, that occurs in meiosis? | Genetic reassortment provides for genetic variability in offspring cells. Unlike in mitosis where a cell reproduces an exact copy of itself, meiosis involves genetic recombination that leads to similar, but new and diverse cells. |
| During what phase of meiosis does genetic reassortment take place? | During prophase 1. |
| During genetic reassortment, portions of one of the chromosomes in each homologous pair break off and exchange. This leads to a small piece of the maternal homologue becoming a part of the paternal homologue and vice versa. | |
| What is the name of the region of physical connection between maternal and paternal homologous pairs where recombination takes place? | The chiasma. |
| Which is the longest phase of meiosis? | Prophase 1 can last up to 90% of the entire duration of meiosis because the very important genetic reassortment event occurs during it. |
| Are the sister chromatids present in a cell in prometaphase 1 identical? | No. While they are very similar, sister chromatids in prometaphase 1 are slightly different because of the small segment of crossover between parental homologous pairs that results from prophase 1 genetic reassortment. |
| Fill in the blanks. During mitosis, chromosomes are separated by microtubules attached to their their _________. In meiosis, on the other hand, a microtubule attaches to a structure called a _________. | Kinetochores or centromeres. Chiasma. |
| What is the main difference between the events of anaphase 1 and those of mitotic anaphase? | During anaphase, maternal and paternal sister chromatids are separated to opposite ends of the cell via microtubules. In anaphase 1 of meiosis, the maternal homologous pair and the paternal homologous pair are separated to opposite ends of the cell before |
| What is the name of the phase of the second meiotic division in which chromosomes align at the center of the cell? | Metaphase 2. |
| How is prophase 1 different from prophase 2? | Recall that during prophase 1, genetic reassortment takes place. As a result, prophase 1 can last many days. During prophase 2, no further genetic reassortment occurs and therefore it lasts only a short time compared to prophase 1. |
| What is the difference between mitotic interphase and the meiotic interphase that separates the two rounds of division? | interphase:monitor cell sz, division, and DNA replication-long phase & meiotic interphase: short, no DNA rep,&, brief chromosome decondensation may occur. |
Created by:
vcopeland
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