Do Now 1 How many cells are produced

Do Now • 1. How many cells are produced in mitosis? • 2. How many cells are produced at the end of meiosis? • 3. Is mitosis asexual or sexual reproduction? What about meiosis? • 4. What three things increase genetic diversity during meiosis? • 5. Name THREE differences between mitosis and meiosis.

Binder HW: 3. 5 Handout (Seat) Set your desk up and silently complete the DO NOW. Today’s EQ: what is the difference between mitosis and meiosis? Today’s Objective: we will be able to compare and contrast mitosis and meiosis in order to identify the different outcomes.

Agenda • • Do Now & Review House keeping items Data Days Reminders Notes Practice BINGO!

Reminders • • • Your unit 3 test is on Thursday/Friday It will cover: Mitosis Meiosis Asexual vs. Sexual Reproduction Genetic Variation • Homework is due on Thursday/Friday

Class Competition Updates

House Keeping • Make up the vocab quiz • If you didn’t turn it in… I NEED it, otherwise it zero

Cell Project Winners • America’s Next Top Cell Model: – 1 st: Tyler (extra bathroom pass, extra credit, and extra homework pass) – 2 nd Paola (extra credit and extra bathroom pass) • Short Stories: – 1 st : Aaliyah – 2 nd: Roy

Mitosis vs. Meiosis

Mitosis Meiosis

• Video comparing mitosis and meiosis

Mitosis vs. Meiosis • Mitosis- division of the nucleus • Meiosis- making of haploid gametes • Mitosis involves ONE nuclear division • Meiosis involves TWO nuclear divisions

Products of Mitosis & Meiosis • Mitosis produces two identical daughter cells • Meiosis produces four genetically different daughter cells

The Numbers • The cells from mitosis are diploid or 2 n. • The cells from meiosis are haploid or n. Definitions: • Diploid (2 n) – full set of chromosomes • Haploid (n) – half set of chromosomes

Haploid vs Diploid • The diploid number (2 n) in humans is 46. • The haploid number (n) in humans is 23. • Example: The diploid number in a horse is 64. What is the haploid number? • Example: The haploid number in cats is 19. What is the diploid number?

The reason why: mitosis • To replace damaged cells • To allow for growth & development • To prevent cells from getting too big • For asexual reproduction

The reason why: meiosis • To create gametes that can combine to make a zygote • For sexual reproduction • To increase genetic diversity (crossing over, independent assortment, random fertilization)

Where do these processes occur? • Mitosis occurs in somatic cells (body cells) like heart cells, skin cells, etc • Meiosis occurs in sex cells (gametes) like sperm & egg cells only.

Pause for The Cause • In four complete sentences, summarize what we went over today make sure to have the following essential vocabulary: mitosis, meiosis, diploid, haploid, gametes, somatic cells, asexual reproduction, sexual reproduction • Silently& independently

MITOSIS MEIOSIS

Word Bank – Partner Practice • • • Comparing Mitosis and Meiosis WS Gametes, somatic cells homologous, together all, egg/sperm cells One, two identical, different are, are not Haploid, diploid two, four