MEIOSIS Pipecleaner review Open to the next blank

MEIOSIS Pipecleaner review Open to the next blank page of your journal Glue in the “Meiosis Pipe-cleaner Activity” page Please wait for a thumbs before moving onto the each phase, and complete the table as you work

MEIOSIS Pipecleaner Activity Work with a partner to create a Somatic Cell! • Create replicated chromosomes by twisting two pipe-cleaners of the same color together • Each partner is responsible for making one set of chromosomes (either chromosomes from mom, or dad) – Mom=white, dad=green • Use a whiteboard and whiteboard marker to show the cell boundaries

MEIOSIS Pipecleaner Activity A male DIPLOID animal has 2 pairs (2 n=4) of chromosomes. Model what the chromosomes look like during PROPHASE I (INCLUDE CROSSING OVER, though you can’t carry it into anaphase) METAPHASE I (INCLUDE INDEPENDENT ASSORTMENT) ANAPHASE 1 TELOPHASE 1

MEIOSIS Pipecleaner Activity Now continue to model what the chromosomes look like during MEIOSIS II PROPHASE 2 METAPHASE 2 ANAPHASE 2 TELOPHASE 2 FINAL SPERM CELLS

MEIOSIS Pipecleaner Activity Now model “Non-disjunction 2” Go back and use pipe-cleaners to model what happens to the 4 chromosomes when one of the chromatids does not separate during Anaphase II. Get Ms. Grant to check your cells, and draw the daughter cells produced at the end of Meiosis II

MEIOSIS Pipecleaner Activity Now model “Non-disjunction 1” using pipe-cleaners to model what happens to the 4 chromosomes when one of the homologous pair does not separate during Anaphase I. Show Ms Grant the final sperm, and draw the cells produced at the end of Meiosis II

MEIOSIS Pipecleaner Activity Answer these analysis questions on the next page of your journal, and get a stamp from Ms. Grant 1. What is the difference between the gametes created with Nondisjunction I and II? 2. Which has a larger effect? 3. What will be the difference in the percentage of effected gametes when this happens in spermatogenesis and oogenesis?