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Meiosis Day 3,4,5& Science Fair walk-
through
Bellwork1. Grab a closure from the front basket. Add at least 2 sentences to it to make it more complete or more correct.
2. Complete this phrase on your bellwork sheet:Meiosis creates _______ cells like _____ and _____. It begins with __ diploid cell and ends with ___ _________ cells.
Have out: book, Meiosis notes, and orange worksheet from yesterday
Announcements & Purpose
Review meiosisUse book to fill in worksheet
Quiz on Meiosis Thursday
Friday: science fair walk through.
Finger Meiosis = 2 (chromatid) chromsomes in each cellHold up 1 pointer finger= this is chromosome 1
from your dad. Hold up other pointer finger= this is
chromosome 1 from your mom =homologous chromosomes
Have them replicate (hold up middle fingers too)
Recombination (mingle them together) Meiosis 1: Pull hands apart Meiosis 2: pull fingers apart= 1 chromatid chromosome in each cell
9. Meiosis
10.Sexual Reproduction
11. Asexual Reproduction
12.Chromatid
13.Chromosome
14.Genetic Recombination
15.Fertilization
16. Independent Assortment
Write Down…
ALL THE Key Terms!
1. Prophase I
2. Metaphase I
3. Anaphase I
4. Telophase I
5. Prophase II
6. Metaphase II
7. Anaphase II
8. Telophase II
17.Ploidy
18.Haploid (n)
19.Diploid (2n)
20.Tetrad
21.Homologous Pair
22.Crossing Over
23.Somatic Cell
24.Germ Cell
25.Gamete
26.Zygote
nb - You have to actually define them to get credit at the end of the unit
SLATE REVIEW- Have out worksheets/notes
The merging of an egg and a sperm is known as:
A) a zygoteB) a gameteC) a tetrad D) a somatic cell
Haploid (1n) or diploid, (2n) metaphase I, metaphase II, anaphase I, telophase I
An egg cell is an example of A) a zygoteB) a gameteC) a tetrad D) a somatic cell
During ‘crossing over’…
A) genes are lost or deletedB) some genes may move to a homologous chromosome
C) homologous pairs may leave the cell
D) chromosomes will be in Metaphase II
Haploid (1n) or diploid, (2n) metaphase I, metaphase II, anaphase I, telophase I
In your body, your skin cells are:
A) somaticB) a 1n gameteC) a 2n gameteD) a gamete
In asexual reproduction, the offspring are:
A) Unique from each otherB) Identical to the parentsC)Unique from their parentsD) Half as many chromatids
When homologous chromosomes line up:
A. Male/female chromosomes will randomly be on either side
B. The paternal chromosomes will be on the left
C. Maternal chromosomes will be on the right
D. homologous chromosomes don’t line up
Metaphase I
METAPHASE 1
ANAPHASE 1
(choose all that apply)
A sperm cell is:A) always diploid B) always haploidC) always a gamete D) half the genetic info. of it’s parent
P. 116-117 Use book to fill in front side of worksheet
Check: Did you label INTERPHASE & does it have
original # of chromatids before replication? How many chromatids did you start out with? Your final number should be half of that If you copied book directly you should start
with 4 original chromatids.
Using book, Define the following vocab on the back of your white Meiosis notetaker
*Chromatid: is one copy of a duplicated chromosome
Diploid
Haploid
Gamete
*Zygote: the initial cell formed when two gamete cells are joined by means of sexual reproduction.
Tetrad
*Somatic Cell: ‘normal’ body cell
Homologous pairs:
Announcements & Purpose
Friday: science fair walk through.
Meiosis exam: MONDAY
At top of page in small writing:Materials: -white board to be drawn on (cells, spindle
fibers) -chalk= represents centriole -lengths of 8 beads= chromatidChromosome # Mom’s Color Dad’s color
1 RED YELLOW
2 WHITE GREEN
mMaterials: -white board to be drawn on (cells,
spindle fibers) -chalk= represents centriole/centrisome -lengths of 8 beads= chromatid
MEIOSIS w/ beads!
Chromosome # Mom’s Color Dad’s color
1 RED YELLOW
2 WHITE GREEN
Create: Meiosis drawingLabel: homologous chromosomes Chromosome # and from mom/dad,
(in at least 2 phases) & crossing overOption 1: draw & label each stepOption 2: take cellphone photos, e-mail it to yourself at school/ print out and label
Bellwork1. What are ‘homologous pairs of
chromosomes’? Draw an example2. What is a somatic cell? How does it
differ from a gamete?3. What is the final product of
meiosis?4. What is your favorite thing you did
this weekend?
Announcements & Purpose
Review meiosis-Go over Meiosis Bead activity-Slate review-Create a quiz-Group slate review (USING QUIZ)
Quiz on Meiosis TOMORROW
Check your Meiosis Bead activity
-Fill in names of each step*Check that your drawing is correct
Holepunch and put in binder at front.
INTERPHASE
PROPHASE
Crossing over occurs
Tetrad= 2 homologous chromosome sets: 4 chromatids
METAPHASE 1
ANAPHASE 1
TELOPHASE 1 CYTOKINESIS
PROPHASE1I METAPHASE II
ANAPHASE II TELEPHASE II & CYTOKINESIS
Meiosis I splits the diploid cell into two haploid cells, which in turn go through meiosis II to produce a total of 4 haploid genetically-different cells. Meiosis II is very similar to mitosis, except that in meiosis II the nuclei start out as haploid.
The reason it is haploid after meiosis I is because each cell has one chromosome set. two sister chromatids still connected at the kinetochore (a dyad) is equivalent to one chromosome. they aren't individual chromosomes until they split during meiosis II.
PROPHASE
Crossing over occurs
Tetrad= 2 homologous chromosome sets: 4 chromatids
=2n
2 identical chromatid= 1 chromosome
2 identical chromatid= 1 chromosome
TELOPHASE 1 CYTOKINESIS
Tetrad= 2 homologous chromosome sets: 4 chromatids
=1n
Tetrad= 2 homologous chromosome sets: 4 chromatids
=1n
SLATE REVIEW- Have out worksheets/notes
The merging of an egg and a sperm is known as:
A) a zygoteB) a gameteC) a tetrad D) a somatic cell
Haploid (1n) or diploid, (2n) metaphase I, metaphase II, anaphase I, telophase I
An egg cell is an example of A) a zygoteB) a gameteC) a tetrad D) a somatic cell
During ‘crossing over’…
A) genes are lost or deletedB) some genes may move to a homologous chromosome
C) homologous pairs may leave the cell
D) chromosomes will be in Metaphase II
Telophase II
Haploid (1n) or diploid, (2n) metaphase I, metaphase II, anaphase I, telophase I
In your body, your skin cells are:
A) somaticB) a 1n gameteC) a 2n gameteD) a gamete
In asexual reproduction, the offspring are:
A) Unique from each otherB) Identical to the parentsC)Unique from their parentsD) Half as many chromatids
Anaphase II
When homologous chromosomes line up:
A. Male/female chromosomes will randomly be on either side
B. The paternal chromosomes will be on the left
C. Maternal chromosomes will be on the right
D. homologous chromosomes don’t line up
Metaphase II
METAPHASE 1
ANAPHASE 1
Metaphase I
What is a tetrad?
• Homologous chromosomes that pair up in a set during prophase 1
End of: Meiosis 1 or Meiosis II?
(choose all that apply)
A sperm cell is:A) always diploid B) always haploidC) always a gamete D) half the genetic info. of it’s parent
Anaphase I
_____________ _____________ occurs creating _____combinations!
Independent Assortmentnew
At the end of Telophase I, there are:
A) 4 haploid daughter cellsB) 2 haploid daughter cellsC) 4 diploid daughter cellsD) 2 diploid daughter cells
At the end of Telophase II, there are:
A) 4 haploid daughter cellsB) 2 haploid daughter cellsC) 4 diploid daughter cellsD) 2 diploid daughter cells
Meiosis quiz• 1. Create a 10 question quiz (with answers on the back)• Include at least 2 drawing questions (a drawing of a phase
and ask them to label it)• Include the following vocab:-Somatic-Sexual reproduction-Asexual reproduction-Crossing over-Gamete-Homologous chromosomes-Diploid-Haploid
BellworkAfter stamp switch quiz with a partner or group mate and answer the questions, then fill in the following on your bellwork: 1.Choose the most difficult
question and write why it was difficult.
2. Choose the most simple question and write why it was simple.3. Why is creating a quiz a valid way to study for an exam?
Announcements & Purpose
Review meiosisUse book to fill in worksheet
Quiz on Meiosis Thursday
Friday: science fair walk through.
Whoa-no-mei-oh-sis.
• http://www.youtube.com/watch?v=iCL6d0OwKt8&feature=player_embedded
Genetics- what do you know?
Closure
