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Question
- mitosis produces two genetically identical daughter cells. do each of your daughter cells contain the same chromosomes? explain. compare this to meiosis.
- for a parent cell that has a total of six chromosomes, sketch what this cell would look like if you were to use beads to model metaphase of mitosis. use the rectangle below to represent your piece of paper. in your sketch, identify each sister chromatid, and indicate if the chromsomes are yellow or red.
Question 10 (Mitosis and Meiosis Comparison)
Brief Explanations
- Mitosis Daughter Cells Chromosomes: In mitosis, the parent cell's chromosomes (after replication, each chromosome has two sister chromatids) separate equally. The daughter cells receive an identical set of chromosomes as the parent (after division, each daughter cell has the same number and type of chromosomes as the parent cell before replication, but with single chromatids per chromosome). This is because mitosis is for growth, repair, and asexual reproduction, so genetic consistency is key.
- Comparison to Meiosis: Meiosis produces four daughter cells (gametes) with half the number of chromosomes (haploid) of the parent (diploid). These daughter cells are genetically diverse due to crossing over (in prophase I) and independent assortment (in metaphase I), unlike mitosis daughter cells which are genetically identical.
Step1: Understand Metaphase of Mitosis
In metaphase of mitosis, the replicated chromosomes (each with two sister chromatids) line up along the equatorial plate (middle) of the cell. The parent cell has 6 chromosomes, so after replication, there are 6 chromosomes (each with 2 sister chromatids), but the total number of chromatids is 12.
Step2: Sketch Structure
- Draw a rectangle (cell).
- Draw 6 chromosomes (can be 3 pairs, but since it's mitosis, homologous pairing isn't a focus here; just line them up at the center).
- Each chromosome has two sister chromatids (so for each of the 6 chromosomes, draw two connected beads or lines to represent sister chromatids).
- Color chromosomes (e.g., 3 yellow and 3 red, or any combination, to show the 6 chromosomes). Label sister chromatids on a few chromosomes to indicate they are identical copies (from replication).
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- Mitosis daughter cells have the same chromosomes: In mitosis, during cell division, replicated chromosomes (with sister chromatids) align at the equator, then sister chromatids separate to opposite poles. Each daughter cell gets a full set of chromosomes identical to the parent cell (in terms of number and genetic content, as no genetic recombination occurs in mitosis).
- Comparison to meiosis: Mitosis produces 2 diploid, genetically identical daughter cells (for somatic cells), while meiosis produces 4 haploid, genetically diverse daughter cells (for gamete production) via two rounds of division, with crossing over and independent assortment introducing genetic variation.