Reproductive Strategies：繁殖策略.pptVIP

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2018-02-11 发布于江西
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Reproductive Strategies：繁殖策略.ppt

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Reproductive Strategies：繁殖策略

GCE BIOLOGY BY2 Reproductive Strategies GCE BIOLOGY BY2 Reproductive Strategies GCE BIOLOGY BY2 Reproductive Strategies GCE BIOLOGY BY2 Reproductive Strategies GCE BIOLOGY BY2 Reproductive Strategies GCE BIOLOGY BY2 Reproductive Strategies GCE BIOLOGY BY2 Reproductive Strategies GCE BIOLOGY BY2 Reproductive Strategies GCE BIOLOGY BY2 Reproductive Strategies GCE BIOLOGY BY2 Reproductive Strategies GCE BIOLOGY BY2 Reproductive Strategies GCE BIOLOGY BY2 Reproductive Strategies 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 20 Which Came First? Chicken Egg The Chicken? The Egg? Place your vote by clicking the ‘Chicken’ or ‘Egg’ button Be prepared to justify your choice Which came first? OR Reproduction What type of reproduction does this animation represent? Hint: Mitosis is involved. Identical offspring to the parent is produced. Simple unicellular organism Next: What type of reproduction? Sexual Occurs when unicellular organisms, such as amoeba reproduce Produces offspring showing variation from the parent Only involves mitosis What Type of Reproduction? Drag the corresponding numbers to the appropriate circle to determine if the statement relates to sexual or asexual reproduction: Asexual 1 2 3 4 1 2 3 4 Outline of Mitosis Diploid parental cell (2n) Duplication of a Chromosome is Followed by nuclear division Diploid daughter cells (2n) Next: Outline of meiosis Outline of Meiosis maternal chromosome paternal chromosome Diploid parent cell (2n) Each chromosome duplicates to form two Pairs of chromatids 2 chromatids centromere Meiosis I Meiosis II Haploid gametes (n) (n) (n) (n) Next: Comparison of mitosis and meiosis Comparison of Mitosis and Meiosis Diploid parental cell 2n First division Diploid daughter cells 2n Haploid gametes n n n n 1st meiotic division (meiosis I) 2nd meiotic division (meiosis I) The Human Life Cycle 2n 2n meiosis meiosis mitosis mitosis 2n zygote 2n fertilisation n n This is an example of a diploid life cycle The Human Life Cycle Drag