Build a pair of replicated, homologous chromosomes. 10 beads should be used to c

Question

Build a pair of replicated, homologous chromosomes. 10 beads should be used to create each individual sister chromatid (20 beads per chromosome pair). Two five-holed beads represent each centromere. To do this...

Figure 5: Bead set-up. The blue beads represent one pair of sister chromatids and the black beads represent a second pair of sister chromatids. The black and blue pair are homologous.

Start with 20 beads of one color to create your first sister chromatid pair. Five beads must be snapped together for each of the four different strands. Two strands create the first chromatid, and two strands create the second chromatid.

Place one five-holed bead flat on a work surface with the node positioned up. Then, two of the four strands into the bead to create an “I” shaped sister chromatid. Repeat this step with the other two strands and another five-holed bead.

Once both sister chromatids are constructed, connect them by their five-holed beads creating an “X” shape.

Repeat this process using 20 new beads (of a different color) to create the second sister chromatid pair. See Figure 5 for reference.

Assemble a second pair of replicated sister chromatids; this time using 12 beads, instead of 20, per pair (six beads per each complete sister chromatid strand).

Figure 6: Second set of replicated chromosomes.

Repeat this process using 12 new beads (of a different color) to create the second set of sister chromatids. See Figure 6 for reference.

Configure the chromosomes as they would appear in each of the stages of the cell cycle (prophase, metaphase, anaphase, telophase, and cytokinesis). Diagram the images for each stage in the section titled “Cell Cycle Division: Mitosis Beads Diagram”. Be sure to indicate the number of chromosomes present in each cell for each phase.

Cell Cycle Division: Mitosis Beads Diagram:

Prophase

Metaphase

Anaphase

Telophase

Cytokinesis

Figure 5: Bead set-up. The blue beads represent one pair of sister chromatids and the black beads represent a second pair of sister chromatids. The black and blue pair are homologous.

Explanation / Answer

Based on the given data, the pattern of mitosis is as follows:

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