Chapter 23

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<strong>23</strong> Pairs of chromosomes of a human cell • The chromosomes labeled X and Y are the sex chromosomes • XX = female • XY = male
(III) Stages of Meiosis • In meiosis, each cell divides twice: 1. The first stage is very similar to mitosis 2. The second stage is also like mitosis with the exception that there is NO replication of chromosomes in the second phase (meiosis 2)
Page 1 and 2: Chapter 23 Meiosis and Sexual Repro
Page 3 and 4: (I) Sexual Reproduction • Two par
Page 5 and 6: (A) Gametes • Sex cells 1. Males
Page 7 and 8: Fertilization and the Stages of Mit
Page 9 and 10: (D) Diploid • Contain the full nu
Page 11: (II) Meiosis • Known as Reduction
Page 16 and 17: Second Division
Page 18 and 19: Key SS = single-stranded DS = doubl
Page 20 and 21: Prophase I • Replication of SS ch
Page 22: Metaphase I • Alignment of the te
Page 25 and 26: Second Meiotic Division
Page 27 and 28: Metaphase II • Tetrads line up in
Page 29 and 30: Telophase II • Both daughter cell
Page 31 and 32: (III) Sexual Reproduction in Animal
Page 33 and 34: (B) Hermaphrodite • Contain both
Page 35 and 36: Spermatogenesis • Primary spermat
Page 37 and 38: Comparison of Ova and Sperm • Egg
Page 39 and 40: Fertilization • Union of a haploi
Page 41 and 42: Internal Fertilization • Takes pl
Page 43 and 44: External Fertilization • Eggs are
Page 45 and 46: External Fertilization Eastern spot
Page 47 and 48: External Fertilization An example o
Page 49 and 50: External Fertilization A frog and m
Page 51: External Fertilization Close-up of

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