Unit 1 Lecture 2: Membrane Structure

Meiosis
Main Effects of Meiosis
Mitosis
1.
Meiosis
1.
2.
Stages of Meiosis
1. Learn the stages of meiosis
2. Where is the change from diploid to haploid?
3. Where does crossing over occur?
Stages of Meiosis
Stages of Meiosis
Metaphase Differences
Organism
2n = 6
Metaphase Differences
Metaphase Differences
Metaphase Differences makes haploid cells
The Law of Segregation just happened….
Metaphase Differences makes haploid cells
Crossing Over modifies chromosomes
Crossing Over modifies chromosomes
Benefits of meiosis
1.
2.
Mistakes in Amount of DNA
Disjunction Errors
Changes in chromosome number
Aneuploidy:
Monosomy:
Trisomy:
Polyploidy:
Sex Chromosomes and Autosomes
Prep for Basics Quiz
Can you do the following?
• Indicate what cells carry out meiosis
• List and describe the phases of meiosis
• Demonstrate how meiosis reduces ploidy
• Show how crossing over changes chromosomes
• Describe the benefits of meiosis
• Explain the effects of nondisjunction
• List the definitions of sex chromosomes and
autosomes

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