MEIOSIS PAGE 60 1 BODY CELLS AND GAMETES

MEIOSIS PAGE 60

1. BODY CELLS AND GAMETES • Body Cell= somatic cells (skin, stomach, bone, etc. ) • Replicated during Mitosis • Gametes= sex cells (sperm and egg) • Made during Meiosis

2. DIPLOID OR HAPLOID? • Body cells are Diploid • Sex cells are Haploid • 46 chromosomes • 23 chromosomes • 2 n • Asexual Reproduction • Sexual Reproduction

3. CHROMOSOMES AND MEIOSIS • Humans have 23 chromosome pairs • 22 autosome pairs • 1 sex chromosome pair (X or Y)

4. HOMOLOGOUS CHROMOSOMES • Homologous Chromosomes match by size • Code for the same Genes • One from Egg, One from Sperm

5. MEIOSIS OVERVIEW • Cell Division creates gametes • 2 cycles of division called Meiosis 1 and Meiosis 2 • There is only one interphase

6. MEIOSIS 1 • One cell splits into two PMAT 1: • Prophase 1 • Metaphase 1 • Anaphase 1 • Telophase 1

6. MEIOSIS 1

7. CROSSING OVER • Happens during PROPHASE 1 • This is what makes every individual Genetically unique • Increases Genetic Diversity

8. MEIOSIS 2 • Two cells split into four PMAT 2 • Prophase 2 • Metaphase 2 • Anaphase 2 • Telophase 2

8. MEIOSIS 2

MITOSIS VS. MEIOSIS

COMPARISON CHART PAGE 61

Exit Slip Meiosis 1. A kidney cell is an example of which type of cell? a. sex cell b. gamete cell c. body cell d. haploid cell 2. Which of the following best describes the genetic material a person receives from his or her father? a. 22 pairs of homologous chromosomes and an X and Y chromosome b. 22 haploid cells and an X or Y chromosome c. 23 diploid cells and an X and Y chromosome d. 22 autosomes and an X or Y chromosome

3. Which phrase best describes the process of meiosis? a. occurs in body cells b. results in genetically identical cells c. happens only in haploid cells d. produces haploid gametes 4. Which of the following statements is true of homologous chromosomes? a. They are exact copies. b. They contain the same genes. c. They divide during meiosis II. d. They connect to each other.