8. 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). Snap each of the four pieces into a new five-
holed bead to complete the set up.
9. Pair up the homologous chromosomes created in Step 8 and 9.
10. SIMULATE CROSSING OVER. To do this, bring the two homologous pairs of sister chromatids together
(creating the chiasma) and exchange an equal number of beads between the two. This will result in chro-
matids of the same original length, there will now be new combinations of chromatid colors.
11. Configure the chromosomes as they would appear in each of the stages of meiotic division (prophase I
and II, metaphase I and II, anaphase I and II, telophase I and II, and cytokinesis).
12. Diagram the corresponding images for each stage in the section titled “Trial 2 - Meiotic Division Beads
Diagram”. Be sure to indicate the number of chromosomes present in each cell for each phase. Also,
indicate how the crossing over affected the genetic content in the gametes from Part1 versus Part 2.
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Meiosis
Part 2 - Meiotic Division Beads Diagram:
Prophase I
Metaphase I
Anaphase I
Telophase I
Prophase II
Metaphase II
Anaphase II
Telophase II
Cytokinesis