End Show 11-4 Meiosis Slide 1 of 35 Copyright Pearson Prentice Hall Each organism _____________________________ __________________________________________. Gametes are formed by a process that separates the two sets of genes so that each gamete ends up with just one set.

End Show 11-4 Meiosis Slide 2 of 35 Copyright Pearson Prentice Hall Chromosome Number –__________________ ____________________ ____________________. A body cell in an adult fruit fly (Drosophila) has 8 chromosomes: 4 from the fruit fly's male parent, and 4 from its female parent.

End Show 11-4 Meiosis Slide 3 of 35 Copyright Pearson Prentice Hall Chromosome Number These ____________________________________. Each of the 4 chromosomes that came from the male parent has a _____________________ from the female parent.

End Show 11-4 Meiosis Slide 4 of 35 Copyright Pearson Prentice Hall Chromosome Number A cell that contains _________________________ ___________________________________. The number of chromosomes in a diploid cell is sometimes represented by the ___________. For Drosophila, the diploid number is 8, which can be written as ___________.

End Show 11-4 Meiosis Slide 5 of 35 Copyright Pearson Prentice Hall Chromosome Number The ________________________ organisms contain only a ___________________, and therefore only a single set of genes. These cells are ___________. Haploid cells are represented by the symbol ____. For Drosophila, the haploid number is 4, which can be written as ____________.

End Show 11-4 Meiosis Slide 6 of 35 Diploid Number (2N) = 46 WHAT WOULD BE THE HAPLOID (N) NUMBER?

End Show 11-4 Meiosis Slide 7 of 35 Copyright Pearson Prentice Hall Phases of Meiosis Meiosis is a process of _____________ _________________________________ ___________________

End Show Slide 8 of Meiosis Copyright Pearson Prentice Hall Meiosis involves two divisions: ____________ By the end of meiosis II, _________________ that entered meiosis has become ______________. Phases of Meiosis

End Show Slide 9 of Meiosis Copyright Pearson Prentice Hall Phases of Meiosis Meiosis I

End Show 11-4 Meiosis Slide 10 of 35 Copyright Pearson Prentice Hall Phases of Meiosis Interphase I __________________ __________________ __________________ __________________ Interphase I

End Show 11-4 Meiosis Slide 11 of 35 Copyright Pearson Prentice Hall Phases of Meiosis Meiosis I: Prophase I __________________ __________________ __________________ __________________ __________________ There are 4 chromatids in a tetrad. I Prophase I MEIOSIS I

End Show Slide 12 of Meiosis Copyright Pearson Prentice Hall Phases of Meiosis When homologous chromosomes form tetrads in meiosis I, they ________________________ __________________________________. Crossing-over produces __________________ ______________.

End Show 11-4 Meiosis Slide 13 of 35 Copyright Pearson Prentice Hall Phases of Meiosis Meiosis I: Metaphase I ____________________ _______________________ ____________________. MEIOSIS I Metaphase I

End Show 11-4 Meiosis Slide 14 of 35 Copyright Pearson Prentice Hall Phases of Meiosis MEIOSIS I Anaphase I Meiosis I: Anaphase I _________________ _________________

End Show 11-4 Meiosis Slide 15 of 35 Copyright Pearson Prentice Hall Phases of Meiosis MEIOSIS I Telophase I and Cytokinesis Meiosis I: Telophase I and Cytokinesis __________________ The two cells produced by meiosis I have chromosomes and alleles that are different from each other and from the diploid cell that entered meiosis I.

End Show Slide 16 of Meiosis Copyright Pearson Prentice Hall Phases of Meiosis Meiosis II The two cells produced by meiosis I now enter a second meiotic division. Unlike meiosis I, ________________________ _________________________________. ___________________________________

End Show Slide 17 of Meiosis Copyright Pearson Prentice Hall Phases of Meiosis Meiosis II

End Show 11-4 Meiosis Slide 18 of 35 Copyright Pearson Prentice Hall Phases of Meiosis Meiosis I results in: __________________ __________________ __________________ __________________ __________________ MEIOSIS II Prophase II

End Show 11-4 Meiosis Slide 19 of 35 Copyright Pearson Prentice Hall Phases of Meiosis Meiosis II: Metaphase II __________________ __________________ __________________ __________________. MEIOSIS II Metaphase II

End Show 11-4 Meiosis Slide 20 of 35 Copyright Pearson Prentice Hall Phases of Meiosis Meiosis II: Anaphase II __________________ __________________ __________________ __________________. MEIOSIS II Anaphase II

End Show Slide 21 of Meiosis Copyright Pearson Prentice Hall Phases of Meiosis Meiosis II: Telophase and Cytokinesis __________________ __________________ MEIOSIS II Telophase II and Cytokinesis

End Show 11-4 Meiosis Slide 22 of 35 Copyright Pearson Prentice Hall Gamete Formation ________________________________________

End Show 11-4 Meiosis Slide 23 of 35 Copyright Pearson Prentice Hall Gamete Formation In many female animals, __________________ from meiosis. The other ________________________, are usually not involved in reproduction.

End Show 11-4 Meiosis Slide 24 of 35 Copyright Pearson Prentice Hall Comparing Mitosis and Meiosis –________________________________ ________________________________.

End Show 11-4 Meiosis Slide 25 of 35 Copyright Pearson Prentice Hall Comparing Mitosis and Meiosis Mitosis Cells produced by mitosis have the _________ ______________and alleles as the original cell. Mitosis allows an organism ______________ _______________. Some organisms reproduce __________ by mitosis.

End Show 11-4 Meiosis Slide 26 of 35 Copyright Pearson Prentice Hall Comparing Mitosis and Meiosis Meiosis Cells produced by meiosis have _______________ as the parent cell. These cells are _______________ from the diploid cell and from each other. Meiosis is how _______________________ produce gametes.

End Show Slide 27 of 35 Copyright Pearson Prentice Hall 11-4 If the body cells of humans contain 46 chromosomes, a single sperm cell should have a.46 chromosomes. b.23 chromosomes. c.92 chromosomes. d.between 23 and 46 chromosomes.

End Show Slide 28 of 35 Copyright Pearson Prentice Hall 11-4 During meiosis, the number of chromosomes per cell is cut in half through the separation of a.daughter cells. b.homologous chromosomes. c.gametes. d.chromatids.

End Show Slide 29 of 35 Copyright Pearson Prentice Hall 11-4 The formation of a tetrad occurs during a.anaphase I. b.metaphase II. c.prophase I. d.prophase II.

End Show Slide 30 of 35 Copyright Pearson Prentice Hall 11-4 In many female animals, meiosis results in the production of a.only 1 egg. b.1 egg and 3 polar bodies. c.4 eggs. d.1 egg and 2 polar bodies.

End Show Slide 31 of 35 Copyright Pearson Prentice Hall 11-4 Compared to egg cells formed during meiosis, daughter cells formed during mitosis are a.genetically different, while eggs are genetically identical. b.genetically different, just as egg cells are. c.genetically identical, just as egg cells are. d.genetically identical, while egg cells are genetically different.