Question

Simulate meiosis by drawing

Two pairs of chromosomes with crossing over

Assume that two of the genes are on chromosome 1, and one of the genes is on chromosome 2.

Allow crossing over to occur between the two genes on the same chromosome.

Also, are there multiple ways that the chromosomes could segregate to produce different results? Show them.

Instructions:

• Set up your cell. The cell you start with should be:

  • A diploid cell

  • It should contain 2 pairs of homologous chromosomes

  • It should be in G1 of the cell cycle, before DNA replication occurs

  • Show 2 heterozygous genes on chromosome pair 1, and 1 heterozygous gene on chromosome pair 2.

Go through the steps of meiosis. Be sure to show and label these in your pictures:

• Label homologous chromosomes and sister chromatids

• Interphase (not part of meiosis, but include this)

  • G1

  • S

  • G2

• Meiosis I (show where the chromosomes are)

  • Prophase I

  • Remember: Show crossing over in this simulation!

  • Metaphase I

    • Remember, there are multiple ways the 2 chromosomes can line up, with different outcomes, show both possibilities all the way to the end of meiosis

  • Anaphase I

  • Telophase I

• Meiosis II (now you should have 2 cells)

  • Prophase II

  • Metaphase II

  • Anaphase II

  • Telophase II

• The resulting gametes

Answer 1

( $ Metaphorst Anaphase L od. Cytokinesis-2 8 Telophane &

sistie chocomatids homologous S, G2 Chromosomes @ PS са Prophase-) Metaphase- Оором- Na Na Ada spa, cytokinesis-1/ Telephase- prophase a

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