1. Parents: Offspring: Cell division: Sexual Reproduction 46 MEIOSIS Produces ___________: _____________________

2. FERTILIZATION: Meiosis - YouTube Why meiosis? __________ (___________) _________ the normal # of chromosomes _________ (___________) _________ the normal # of chromosomes ____________ (___________) normal # of chromosomes (2 of each) + = __

3. PROS ◦ __________________________ The MOST IMPORTANT benefit!!! CONS ◦ Not as________ as asexual reproduction (can’t produce as many offspring) ◦ Need to find a __________ Meiosis

4. Cells in your _____ have a __________ set (all __) - they are called _________ _____ cells (sperm and eggs) only have ______ (___) - they are called ___________

6. Genetic Variation in Meiosis Genetic Recombination Crossing Over _________________

7. INDEPENDENT ASSORTMENT Homologous pairs of chromosomes are “sorted” differently each time a gamete is formed Sperm from the same man and eggs from the same woman can have different combinations of genes because of this independent assortment! Genetic Variation in Meiosis Example: What are the possible gametes that will be produced from this diploid cell? HINT: Each gamete will get one “S” and one “T”

8. 1. CROSSING OVER (prophase I) 2. INDEPENDENT ASSORTMENT (metaphase I) 3. RANDOM FERTILIZATION 3 Sources of Genetic Variation in Meiosis

9. Type of divisionMitosisMeiosis DNA Replicates before cell divides? Parent Cell Haploid or Diploid? 2n or n? Daughter cell Haploid or Diploid? 2n or n? # of divisions # of daughter cells produced Type of reproduction? Stability (identical) or variation (different) Somatic or gamete How does chromosome number change?

10. Meiosis and Sexual Reproduction: Practice Which of the following types of cells would experience mitosis, meiosis, or both? Write ME for meiosis, MI for mitosis. ____A pollen cell of a plant ____A leaf cell of a plant ____A root cell of a plant ____The cells in the petal of a flower ____Stem cells ____Kidney cells ____Liver cells ____Testes cells ____Ovary cells ____Tree bark cells