From a piece of blank paper, cut out three sets of four cigar-shaped structures (a total of 12 structures). These will represent chromatids. Be sure each member of a set of four chromatids has the same length and girth. In set one, label two chromatids 'A' and two chromatids 'a.' Cut each of these chromatids about halfway across near their midpoint and slide the two 'A' chromatids together at the cuts to form a single set of attached sister chromatids. Do the same for the 'a' chromatids. In the second set of four chromatids, label two 'B' and two 'b.' Cut and slide these together as you did for the first set, joining the 'B' chromatids together and the 'b' chromatids together. Repeat this process for the third set of chromatids, labeling them as 'D' and 'd.' You now have models for three pairs of homologous chromosomes, for a total of six chromosomes. Give the genotype of the cell with six chromosomes.
9. Mitosis and Meiosis
Mitosis
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Consider a diploid cell with 2n = 6. During which phase of mitosis would you expect to observe chromosomes aligned at the center of the cell?
A
Anaphase
B
Telophase
C
Metaphase
D
Prophase
Verified step by step guidance1
Recall the stages of mitosis: Prophase, Metaphase, Anaphase, and Telophase, each with distinct chromosome behaviors.
Understand that during Prophase, chromosomes condense and become visible but are not yet aligned in the center.
Recognize that Metaphase is characterized by chromosomes aligning at the metaphase plate, which is the center of the cell.
Note that during Anaphase, sister chromatids separate and move toward opposite poles, so chromosomes are no longer centered.
During Telophase, chromosomes reach the poles and begin to decondense, so they are not aligned at the center.
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