Bellwork:
1. Have out your
Notecard Sticker
Sheet. Lay out
your notecards
(definition side up)
on your desk 6x5
“Allele” needs to
be top left card.
2. Have out Page 55.
3. Write the word
and label with the
correct letter.
Collect Today
Page 60 – Cancer Webquest
Notecard Definitions
Assigned
Page 59 – Cell Cycle Concept Map Corrections (Monday)
Notecard ALL PARTS (Friday)
Cell Cycle/Vocabulary Make-Up Quiz (Friday)
Most Missed Quiz Make-Up (Friday)
Late
Page 59 – Cell Cycle Concept Map (-50%)
Page 58 – Cell Cycle Foldable (-30%)
Unit 4 – Cell Cycle
Definitions Due Friday (11/6/15)
All Parts Due Friday (11/13/15)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Allele
Anaphase
Cancer
Cell Cycle
Centriole
Centromere
Chromatid
Chromosome
Crossing Over
Cytokinesis
Daughter Cell
12. Diploid
13. Electrophoresis
14. Frameshift
Mutation
15. Gamete
16. Gene
17. Genetic Disorder
18. Genome
19. Haploid
20. Interphase
21. Karyotype
22. Meiosis
23.
24.
25.
26.
27.
28.
29.
Pg 54
Metaphase
Mitosis
Mutation
Offspring
Point Mutation
Prophase
Sexual
Reproduction
30. Somatic
31. Telophase
32. Tumor
Essential Question Pg 55
What is meiosis and how is it
different from mitosis?
Standard
B.6G – Recognize the significance of meiosis in sexual
reproduction
On a cellular level, what happens during sex?
Biologically speaking, what’s the point of sex?
If YOU are human, then YOUR cells have 46 chromosomes and
your parents’ cells each have 46 chromosomes. Agreed?
If you get DNA from both your parents then why wouldn’t
you end up with 92 chromosomes?
Aaron: It’s because the male gamete actually only contributes 35 of the
chromosomes and the female gamete contributes the remaining 11
Brittney: When the male and female gamete join, the result is 92
chromosomes but as the baby develops, chromosomes that are not
needed are destroyed during mitosis.
Karen: There must be some way that the male and female gamete each
carry only 23 of the chromosomes from each parent so that when they get
together they equal 46.
Blake: The gametes each contain the full 46 chromosomes from each
parent but when fertilization occurs only the first 23 that pair up are used.
When gametes (sex cells) are formed, a process occurs that
separates the two sets of genes so that each gamete ends
up with just one set.
Karen: There must be some way that the male and female
gamete each carry only 23 of the chromosomes from
each parent so that when they get together they equal
46.
Chromosomes are located in
the cell nucleus.
An organism inherits a single
copy of each chromosome
from both its parents.
Because every organism has
two parents, each organism
carries two sets of
chromosomes.
The two sets of
chromosomes (one from
mom and one from dad) are
homologous.
A cell that contains both sets of homologous
chromosomes is said to be diploid.
Diploid means “two sets”.
2N is used to represent the number of chromosomes
in a diploid cell.
When gametes
(sex cells) are
formed, there
must be a process
that separates the
two sets of genes
so that each
gamete ends up
with just one set.
The gametes contain only a single set of chromosomes
and are said to be haploid.
Haploid means “one set”.
N is used to represent the # of chromosomes in a
haploid cell.
Meiosis is a process in which
the number of chromosomes
per cell is cut in half through
the separation of homologous
chromosomes in a diploid cell.
** Meiosis is how gametes are
produced**
Meiosis usually involves two divisions called meiosis 1
and meiosis 2.
By the end of meiosis, the diploid cell that entered
meiosis has become four haploid cells.
During Prophase I of meiosis, chromosomes line up to form
homologous pairs.
When crossing over occurs genetic material is exchanged
between maternal and paternal chromosomes.
Crossing over results in genetic variation.
Mom’s
chromosome
Dad’s
chromosome
Label the diagram
Crossing over
Result = genetic variation
Crossing
Over
Mom’s
chromosome
DNA
Replication
Dad’s
chromosome
Crossing
Over
The diagram below shows the possible variations
for just one chromosome set going through
Meiosis. Imagine the possibilities you could get
with 46!!!
In male animals, the haploid gametes produced by
meiosis are called sperm.
In female animals, the haploid gametes produced by
meiosis are called eggs.
Mom’s
chromosome
MITOSIS
Identical Copy
Dad’s
chromosome
Identical Copy
Mitosis results in two genetically identical diploid cells.
Mitosis is used for growth and repair.
Mitosis is used for somatic (body cell) production.
Meiosis results in four genetically different haploid cells.
Meiosis is used for gamete production and increased genetic variation.
Mitosis is used for growth and repair.
Meiosis is used for gamete production
and increased genetic variation.
Mitosis
Meiosis