uestion. nagine that A and B represen two cells, ach having 42 chromosomes.[Cell A ndergoes mitotic cell division, while cell B ndergoes meiotic cell division. "hat is the number of chromosomes present in the aughter cells produced from cell A? 21 D 42 63 84

alt fn ctrl hp HP Laptop Sameness and Variety (Mitosis and Meiosis) 165 EXERCISE #3 "Asexual Reproduction of Cells-Mitosis" Asexual reproduction of cells is called mitosis. Immediately before this cell division process begins, the DNA of a cell (either haploid or diploid) duplicates itself creating two identical copies of every DNA molecule (and chromosome). The DNA copies move to opposite ends of the cell. Then the cell partitions itself into two cells (each with exactly the same DNA as the original cell). The purpose of asexual reproduction by mitosis is to create new cells that are genetically identical to the original cell. Mitosis produces more of the same. Haploid mitosis does happen in some organisms, but will be covered in a more advanced biology course. Diploid Mitosis (2n (2n 2n (2n 2n 1. Let's imagine what would happen to the amount of DNA material in a cell if, when it reproduced, it did not duplicate the DNA first. Complete this cell box. Problem 2n 2n) 2n V2n (V2n) 2.…

The Karyotype • Karyotype [KAER-ee-oh-tihp]: To prepare a karyotype: A cell sample is collected and treated to stop The sample is stained, which produces chromosomes that is clearly visible under a microscope Chromosomes are and The autosomes are numbered, labelled as K » X }( 13 . 19 ❤. 15 20 {{ 10 16 21 on the and the sex chromosomes are 25 12 K= during 22 12 18 Su X/Y

B-Meiosis 1. Using the same set of wires, pair the homologous chromosomes. What stage is this? 1.a. Assume crossing-over between non-sister chromatids (use the long green wire with a red segment at the tip and the long red wire with a green segment at the tip). What stage is this? 1.b. Draw and label the chromosomes showing the interchanged segments. Chromosome number Chromosome composition L Stage 1.c. What is the significance of crossing over? 2. Draw and label the chromosome at metaphase I. Metaphase I Chromosome number Chromosome composition 2.a. How is this stage different from metaphase of mitosis?

Please keep it short. Don't add a lot of information, thanks! - Explain why it is important that meiosis converts diploid cells to haploid.  Then briefly explain how meiosis does that, makes a diploid cell haploid.

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