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Meiosis. Gamete vs. Zygote What is a Zygote? When two gametes come together (fertilization)

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Presentation on theme: "Meiosis. Gamete vs. Zygote What is a Zygote? When two gametes come together (fertilization)"— Presentation transcript:

1 Meiosis

2 Gamete vs. Zygote What is a Zygote? When two gametes come together (fertilization)

3 Why your body can not use mitosis to make sperm or eggs?

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7 Gamete vs. Zygote What is a Zygote? When two gametes come together (fertilization)

8 To produce the needed number of chromosomes in the sperm and eggs…

9 Diploid and Haploid Cells Reproduction 6.Haploid cells do not have all the DNA and therefore can not function like somatic cells

10 Gamete vs. Zygote What is a Zygote Diploid

11 Review!

12 Meiosis

13 Homologous Chromosomes 7.Chromosomes are lined up from biggest to smallest (except the last pair). Each pair contains one pink (maternal) and blue (paternal) chromosome. The pairs are homologous. 8.X and Y are the sex chromosomes – they determine the sex of the individual

14 Homologous Chromosomes 9. Each pair is homologous – meaning it is the same size, shape and carries the same genes. Homologous Chromosomes – Chromosomes that are the same size, shape and carry the same genes

15 10.

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17 Review!

18 Cell Division with Meiosis

19 The cell cycle remains the same except… G1 S G2 Division: meiosis & cytokinesis

20 VIDEO

21 Prophase I Prophase I is the longest and most complex phase. All of the events that occurred during prophase of mitosis occur + Homologous chromosomes come together to form a SYNAPSE (TETRAD). CROSSING-OVER occurs.

22 Prophase I Crossing Over Mixed Up DNA!

23 Metaphase I

24 Anaphase I

25 Telophase I / Cytokinesis

26 REVIEW!

27 Meiosis II Meiosis II usually comes directly after cytokinesis. No growth (interphase) takes place. Meiosis II is broken into 4 events: prophase II metaphase II anaphase II telophase II. The steps of Meiosis II are identical to mitosis.

28 Prophase II Prophase II is the same as prophase in mitosis.

29 Metaphase II Metaphase II is the same as metaphase in mitosis.

30 Anaphase II Anaphase II is the same as anaphase in mitosis. Notice that the sister chromatids separate.

31 Telophase II Telophase II is the same as telophase in mitosis.

32 VIDEO

33 Review!

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39 Introduction to Meiosis Review Sheet

40 Do you know meiosis?

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43 Required Reading #3

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