II. Sexual Reproduction & Meiosis By Addy Lundberg

II. Sexual Reproduction & Meiosis By Addy Lundberg

II. Sexual Reproduction & Meiosis By Addy Lundberg John Swett High School Crockett, CA

A. Sexual Reproduction 1. Asexual repro. needs only one parent 2. Sexual repro. needs two sex cells a. Sperm--male sex cell b. Egg--female sex cell

B. Importance of Sex Cells 1. In body cells, chromosomes found in pairs a. Pairs form because chromosomes are alike b. Cell with 2 of every kind of chromosome is diploid

c. Sex cell is haploid--23 in egg or sperm B. Importance of Sex Cells 2. Sexual repro starts with cex cell & ends with fertilization a. Zygote is formed--in human now is diploid

or 2n with 46 chromosomes C. Meiosis--Sex Cell Formation 1. In meiosis, there are 2 divisions of the nucleus: meiosis I & meiosis II 2. Prophase I: double stranded csomes

and spindle fibers appear; nuclear membrane and nucleolus fade 3. Metaphase I: chromosome pairs (chromatids) line up spindle fibers attach to centromeres and

centrioles 4. Anaphase I: chromotids separate from matching pair 5. Telophase I: cytoplasm divides and 2

cells form 6. Prophase II: chromatids and spindle fibers reappear 7. Metaphase II: chromatids line up in the

center of the cell spindle fibers attach to centromere & centriole 8. Anaphase II: centromere divides chromosomes split and move to opposite poles

9. Telophase II: spindle fibers disappear nuclear membrane forms around chromosomes at each end of cell each nucleus has half the # of chromosomes as the original (haploid) now there are 4 sex cells (daughter cells)

Diploid (2n) Haploid (n)

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