Copy the following paragraph and fill in the missing blanks. Some of the words will not be used. chromatids crossing-over DNA recombination half homologousmeiosis mitosis sex twice variability

For eukaryotic organisms to mate through sexual reproduction, MEIOSIS occurs in their gametes or SEX cells. This process is similar to mitosis, but it has some differences such as it

goes through the cell division stages twice and produces cells with HALF the number of chromosomes. The chromosomes might overlap and swap DNA fragments when they are

pulled apart during Prophase I; this process is called CROSSING-OVER and it leads to more genetic VARIABILITY among the offspring.

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HAPPY MONDAY

Unit 4 – Cell CycleDefinitions Due Friday (11/6/15)All Parts Due Friday (11/13/15)

Period 6 – All Parts Due Thursday (11/12/15)

1. Allele2. Anaphase3. Cancer4. Cell Cycle5. Centriole6. Centromere7. Chromatid8. Chromosome9. Crossing Over10. Cytokinesis11. Daughter Cell

12. Diploid13. Electrophoresis14. Frameshift Mutation15. Gamete16. Gene17. Genetic Disorder18. Genome19. Haploid20. Interphase21. Karyotype22. Meiosis

23. Metaphase24. Mitosis25. Mutation26. Offspring27. Point Mutation28. Prophase29. Sexual Reproduction30. Somatic31. Telophase32. Tumor

Pg 54

Collect TodayPage 59 – Cell Cycle Concept Map CorrectionsNotecard Sticker Sheet

AssignedVocabulary Quiz – TOMORROW!!!Page 61 - Mitosis vs MeiosisNotecard ALL PARTS (Friday)Cell Cycle/Vocabulary Make-Up Quiz (Friday)Most Missed Quiz Make-Up (Friday)

Late Page 58 – Cell Cycle Foldable (-50%) Page 60 – Cancer Webquest (-30%)

Organize Buff Binder – Buff Binder Quiz

sometime this week.

Essential Question How does meiosis differ

from mitosis?Standard

B.6G – Recognize the significance of meiosis in sexual reproduction

Pg 61

A cell that contains both sets of homologous chromosomes is said to be diploid.Diploid means “two sets”.2N is used to represent the number of chromosomes in a diploid cell.

The gametes contain only a single set of chromosomes and are said to be haploid.Haploid means “one set”.N is used to represent the # of chromosomes in a haploid cell.

Meiosis is a process in which the number of chromosomes per cell is cut in half through the separation of homologous chromosomes in a diploid cell.

** Meiosis is how gametes are produced**

Meiosis usually involves two divisions called meiosis 1 and meiosis 2.By the end of meiosis, the diploid cell that entered meiosis has become four haploid cells.

During Prophase I of meiosis, chromosomes line up to form homologous pairs.

When crossing over occurs genetic material is exchanged between maternal and paternal chromosomes.

Crossing over results in genetic variation.

Label the diagram

Dad’s chromosome

Mom’s chromosome

Crossing over

Result = genetic variation

In male animals, the haploid gametes produced by meiosis are called sperm.In female animals, the haploid gametes produced by meiosis are called eggs.

Dad’s chromosome

Mom’s chromosome

Crossing Over

DNA Replication

Crossing Over

MEIOSIS

Mom’s chromosome

Dad’s chromosome

Identical Copy

Identical Copy

MITOSIS

Mitosis results in two genetically identical diploid cells. Mitosis is used for growth and repair.Mitosis is used for somatic (body cell) production.

Meiosis results in four genetically different haploid cells.

Meiosis is used for gamete production and increased genetic variation.

Mitosis is used for growth and repair. Meiosis is used for gamete production and increased genetic variation.

Mitosis Meiosis

Compare and Contrast Mitosis vs Meiosis by

copying the diagram and filling it in.

Mitosis Meiosis

Mitosis MeiosisBoth