1. Why is Mitosis important?
Warm Up Answer the following on your notebook sheet of paper you started on Monday
What is Mitosis?
Why is Mitosis important?
Compare the daughter cells of Mitosis to the original parent cell.
REMINDER: If you have a test to make up, you must make arrangements with me ASAP! You do not want to wait until the last minute with finals around the corner!!!

2. Importance of Sexual Reproduction
As you watch the video, write down 2-3 reasons that sexual reproduction is beneficial. Why Sex?

3. Meiosis and Genetics Packet – pg. 1
Mitosis
Meiosis
Asexual Reproduction
Sexual Reproduction
Somatic Cell
Gamete (Sex Cell)
body
Any cell forming the __________
of an organism, not a sperm or egg cell.
Examples:
Reproductive cells that unite during sexual reproduction to form a new cell called a zygote.
Examples:
Heart cell, liver cell, skin cell
Sperm cell or egg cell only!

4. Meiosis and Genetics Packet – pg. 1
Diploid
Haploid 2
half
Cells containing ____ complete
sets of chromosomes.
How to write it:
____ ( ____ + ____ = ____ )
Human ex.:
____ = ____ in all somatic cells
Cells containing __________ the
number of chromosomes as diploid.
This means a haploid cells only contains one complete set of chromosomes.
How to write it:
____
Human ex.:
____ = ____ in sperm cells
____ = ____ in egg cells
2n n n n n n 2n n

5. Half the # of chromosomes
Chromosome Worksheet
Follow along as we read the background paragraph together.
Replicated by Meiosis
Sexual Reproduction
Replicated by Mitosis
Asexual Reproduction
Gametes:
Sperm & Egg Cells
Somatic Cells:
All Other Cells
Haploid: (n)
Half the # of chromosomes
Diploid: (2n)
Chromosomes in pairs
Sperm
(n)
Egg
(n)
Embryo
(2n)
In humans:
Sperm
n = 23
Egg
n = 23
Embryo
2n = 46

6. Chromosome Worksheet
Species
# of Chromosomes in Diploid Cells (2n)
# of Homologous Chromosome Pairs in Diploid Cells
# of Chromosomes in Haploid Cells (n)
Homo Sapiens
2n = 46
23 pairs
n = 23
Fruit Fly
2n = 8
4 pairs
n = 4
Housefly
n = 6
2n = 12
6 pairs
Bat
22 pairs
2n = 44
n = 22
Complete the rest of the FRONT of this handout on your own.
If you have any questions, please raise your hand.
Once you finish the front AND get it checked by me,
begin working on the back of this handout until we move on.

7. Meiosis and Genetics Packet – pg. 1
Mitosis
Meiosis
Location of Process
Location of Process
all somatic cells
in the ovaries or testes
Fertilization
Fertilization
Process of fertilizing an egg, female egg, or plant involving the fusion of male gametes to form a zygote.
Draw it:

8. Exit Ticket Write the answers to the questions below in the
space provided on the back of your warm-up
handout.
What type cells undergo meiosis?
What’s the difference between haploid and diploid cells?
Which type of cells are diploid cells?

9. Monday –
Warm-up: Answer questions 1 and 2 on your Meiosis Warm up sheet I handed you at the door. Use your Protocol for MC Questions.
REMINDERS
If you were absent on a test or quiz day, please be prepared to stay to make up your missing work. I will remind those students who need to stay.
Everyone is encouraged to attend tutorials this Tuesday/Wednesday!!!
There will be a quiz over Meiosis this Wednesday/Thursday.

10. Chromosome Worksheet
Complete #1-6 on the BACK of the Chromosome Worksheet you received Friday.
If you have questions or want to check your answers, please raise your hand.

11. Mitosis vs. Meiosis Video
As you watch the video, fill out as much of SECTION 3 of the packet as you can.
Mitosis vs. Meiosis

12. Meiosis and Genetics Packet – pg. 3
Fill out the remainder of SECTION 3 using the information from the video.
If you are stuck, you may visit the solution station.
You may not bring anything to the solution station except yourself. NO PENCIL, NO PAPER.
You may not talk while your at the solution station.
You may only visit the solution station once you’ve attempted to answer the questions on your own.

13. Meiosis and Genetics Packet – pg. 1
Karyotype
A picture of a person’s chromosomes that shows number, form, and size of the chromosomes. It used to determine the sex of an organism and see any chromosomal disorders.
Male: _____ Female: _____
Now, answer # 7-8 on the BACK of the Chromosome Worksheet.
Be sure to explain how you identified the sex when you answer #8.

14. Exit Ticket Write the answers to the questions below in the
space provided on the back of your warm-up
handout.
What is an autosomal chromosome?
What is a gamete? How many chromosomes does a gamete have?
How do you identify sex using a karyotype?

15. Wednesday –
Warm-up:
Take out your Meiosis Warm-up Problems Handout and answer # 3-4 using your sticky note and the Protocol for MC Questions.
REMINDERS
There will be a quiz over Meiosis this Wednesday/Thursday.
Mrs. Luster has tutoring Wednesday in room 2312.
Ms. Derbes has tutoring Thursday in room 2313.

16. Warm-up
Which term refers to the orderly series of events that distributes one chromosome from each pair of homologous chromosomes in a primary sex cell to the nucleus of a gamete?
______________________
mitotic cell division
meiotic cell division
fission
deletion

17. Warm-up
Which of the following best describes the number of chromosomes in a normal human liver cell?
_______________________
23 pairs of chromosomes
46 different types of chromosomes
46 male chromosomes and 46 female chromosomes
23 original chromosomes and 23 duplicate chromosomes

18. Mitosis and Meiosis Simulation
Simulation Activity
Follow along with the video using your model chromosomes, whiteboard, and dry erase marker.
Mitosis and Meiosis Simulation

19. Meiosis and Genetics Packet – pg. 2
Follow along as we fill out SECTION 2 of your packet.
You will need two different colored pencils/markers
Pay special attention to:
Type of cell that’s produced
Crossing Over
# of Divisions
# of Daughter Cells
Genetic Variation

20. 2 identical daugher cells are created
This is what your cells look like in G1, then during S phase, the chromosomes are duplicated to look like this:
1 division
2 identical daugher cells are created

21. Meiosis and Genetics Packet – pg. 2
Follow along as we fill out SECTION 2 of your packet.
Pay special attention to:
Type of cell that’s produced
Crossing Over
# of Divisions
# of Daughter Cells
Genetic Variation

23. 1st division
2nd division
4 non-identical cells are created, genetically varied

24. Meiosis and Genetics Packet – pg. 1
Crossing Over
Crossing Over
The exchange of genes between homologous chromosomes, resulting in a mixture or parental characteristics in offspring.
Draw it:
Nondisjunction
The failure of homologous chromosomes or sister chromatids to separate properly during cell division.
Example:
Down Syndrome, Turner’s Syndrome, Kleinfelter’s Syndrome

25. Meiosis and Genetics Packet – pg. 1
Crossing Over
Crossing Over
The exchange of genes between homologous chromosomes, resulting in a mixture or parental characteristics in offspring.
Draw it:
Nondisjunction
The failure of homologous chromosomes or sister chromatids to separate properly during cell division.
Example:

26. Picture Review Practice
For each picture, write down the following:
# of daughter cells: 2 or 4
Type of division: Meiosis or Mitosis
Type of cell: Somatic of Gametes

34. Meiosis Quiz Put away all of your notes.
Make sure you use your protocol when answering questions.

35. Friday –
Warm-up:
Take out your Meiosis Warm-up Problems Handout and answer # 2 using your sticky note and the Protocol for MC Questions.
REMINDERS
If you missed the Meiosis Quiz yesterday, be sure to make it up ASAP.

36. Warm-up Which situation is a result of crossing-over during meiosis?
_____________________
genes are duplicated exactly, ensuring that offspring will be identical to the parents
chromatids thicken and align themselves, helping to ensure genetic continuity
genes are rearranged, increasing the variability of offspring
chromatids fail to sort independently, creating abnormal chromosome numbers

37. What do you notice about these 2 individuals?
Do you see any physical signs that a mutation may have occurred?
How might these mutations have occurred?

38. Wolf-Hirschhorn syndrome
Down’s Syndrome

39. Meiosis and Genetics Packet – pg. 3
mom dad
Count the # of chromosomes in this human karyotype.
Chromosomes are always numbered from biggest to smallest.
Lets # them!
Remember: You get set from your mom and one from your dad.
Human Karyotype
Is this cell diploid or haploid?
Diploid: 2n
Haploid: n

40. Meiosis and Genetics Packet – pg. 3
mom dad
Autosomes are all of the chromosomes besides the sex chromosomes.
This includes pairs 1-22 in humans.
Draw a square around each pair of autosomes.
Make a note that the square represents autosomes.
Human Karyotype
Key
□: autosome

41. Meiosis and Genetics Packet – pg. 3
mom dad
Sex chromosomes are the last pair.
The X chromosome is always larger than the Y chromosome.
Identify the sex.
Male: XY
Female: XX
Draw a circle around each pair of sex chromosomes.
Make a note that the circle represents sex chromosomes.
Human Karyotype
Key
□: autosome
O: sex chromosome

42. Meiosis and Genetics Packet – pg. 4
Complete practice problems #1-3 found in SECTION 4 of your packet on your own.
Karyotype 1
Circle: male or female
Proof: _____________
Total # of chromosomes:
_____
Disorder: yes or no
If disorder, what kind:
____________________
Y chromosome 47
Kleinfelter’s (2 Xs)

43. Meiosis and Genetics Packet – pg. 4
Karyotype 1
Circle: male or female
Proof: _______________
Total # of chromosomes:
_____
Disorder: yes or no
If disorder, what kind:
____________________
no Y chromosome 45
Turner’s (no Y)

44. Meiosis and Genetics Packet – pg. 4
Karyotype 1
Circle: male or female
Proof: _______________
Total # of chromosomes:
_____
Disorder: yes or no
If disorder, what kind:
____________________
no Y chromosome 47
Down’s Syndrome
aka. Trisomy 21

45. Meiosis and Genetics Packet – pg. 4
Karyotype 1
Circle: male or female
Proof: _______________
Total # of chromosomes:
_____
Disorder: yes or no
If disorder, what kind:
____________________
no Y chromosome 46

46. Find the mutation…

47. Turners Syndrome 1 in 5,000 births 45 chromosomes X only
#23 Monosomy Nondisjunction

48. Turners Syndrome 96-98% do not survive to birth No menstruation
No breast development
No hips
Broad shoulders and neck

49. Find the mutation…

50. Cri-Du-Chat Syndrome 1 in 216,000 births 46 chromosomes XY or XX
#5 Deletion of lower arm

51. Cri-Du-Chat Syndrome Moon-shaped face Heart disease Mentally retarded
Malformed larynx
Normal lifespan

52. Find the mutation…

53. Aniridia-Wilms Tumor Syndrome
1 in 50,000,000 births
46 chromosomes XY or XX
#11 Deletion of upper arm

54. Aniridia-Wilms Tumor Syndrome
Mentally retarded
Growth retarded
Blindness
Tumors on kidneys
Short lifespan

55. Find the mutation…

56. Thirteen Q Deletion Syndrome
1 in 500,000 births
46 chromosomes XY or XX
#13 Deletion of lower arm

57. Thirteen Q Deletion Syndrome
Mentally retarded
Deformed face
No thumbs
Heart disease
Short lifespan

58. Find the mutation…

59. Prader-Willi Syndrome
1 in 5,000,000 births 46 chromosomes
XY=97% XX=3%
#15 Deletion of lower arm

60. Prader-Willi Syndrome
Small bird-like head
Mentally retarded
Respiratory problems
Obesity
Short lifespan

61. Find the mutation…

62. Eighteen Q Deletion Syndrome
1 in 10,000,000 births
46 chromosomes XY or XX
#18 Deletion of lower arm

63. Eighteen Q Deletion Syndrome
Mentally retarded
Heart disease
Abnormal hands and feet
Large eyes
Large ears
Normal lifespan

64. Exit Ticket Put all of your notes away.
Complete the following exit ticket by filling in the blanks associated with the karyotype you’ve been given.
When you finish, please flip it over.