Today is Friday (!),November 15th, 2013

Pre-Class:Today is our review. Have any

questions?

Reminder: Chromosomes, Mitosis, Meiosis Questions was due today, Mitosis Flipbook is due next class.

Today’s Agenda

• The Freeform “Lab”• Review• Review• Review

Warm-Up

• Let’s take a look at some actual cells undergoing mitosis.

• As you know, under the microscope things aren’t so “ideal.”

• Here’s what you might see:– Note: This is an onion root

tip, so it’s a plant cell.– Look near the tip for more

mitosis.http://online.santarosa.edu/homepage/cgalt/BIO10-Stuff/Ch08-A-Mitosis/Onion_Root_Tip_Mitosis_Stages-02.jpg

Mitosis or Meiosis

• Using your partners and your whiteboards, tell me (quickly) whether each of the following statements describes mitosis or meiosis.

• Standard trivia questions to follow.

Mitosis or Meiosis:Question #1

• Four new cells are formed from each original.– Meiosis (spermatogenesis/oogenesis).

Mitosis or Meiosis:Question #2

• This type of cell reproduction helps you grow (or repair/replace old cells).– Mitosis.

Mitosis or Meiosis:Question #3

• This makes cells with half the original cell chromosome number.

• 1 imaginary bonus point if you’re really specific.– Meiosis I.

Mitosis or Meiosis:Question #4

• New egg cells are made this way.• 1 imaginary bonus point if you’re really

specific.– Oogenesis.

Mitosis or Meiosis:Question #5

• New sperm cells are made this way.• 1 imaginary bonus point if you’re really

specific.– Spermatogenesis.

Mitosis or Meiosis:Question #6

• This makes cells with the same chromosome number as the original.

• 1 imaginary bonus point if you give two correct answers.– Mitosis or Meiosis II.

Question #7

• A human haploid cell has this many chromosomes.– 23.

Question #8

• A specific example of (not a term for) a human haploid cell is this.– Sperm or Ovum.

Question #9

• A human diploid cell has this many chromosomes.– 46.

Question #10

• We call human sex cells (sperm/egg) by this general term.– Gametes.

Question #11

• BONUS NON-BIOLOGY QUESTION• You may wager any/all of your points.• Category: Presidents

• Who is the only United States president to have survived two assassination attempts (both, coincidentally, by women)?– Gerald Ford.

Question #12

• Why is crossing over a good thing?– Increases genetic variability.

Question #13

• What do cells that have cell walls develop in place of a cleavage furrow in order to undergo cytokinesis?– Cell plate (then they build the cell wall along it).

Question #14

• What are the two sets of possible resulting cells from the process of meiosis? (as in, how many of what type of cell are made by each kind of meiosis – NOT phase of meiosis)– Four sperm cells OR one egg cell and three polar

bodies.

Question #15

• What’s the difference between daughter cells and sister chromatids?– Daughter cells are actual cells – the two cells that

were produced during mitosis.– Sister chromatids are the two identical halves of

an X-shaped chromosome. They contain the same DNA and are located in the nucleus.

Question #16

• BONUS NON-BIOLOGY QUESTION• You may wager any/all of your points.• Category: Candy

• Which candy company owns the trademark to the Kit-Kat Bar? (note: other companies still make Kit-Kat and have a license to produce it, but only one company truly owns it)– Nestlé.