Tuesday Feb 17th-Week 7
Science of Life
TOPIC: Meiosis
 OBJ : 7-9
DO NOW: What is a homologous chromosome?
Test Monday, February 23rd
*Pass out work*
-Go Over Lab
-Review 10.1 Reading Qs
-Start 10.1 App. Notes
HANDOUTS to PICK-UP:
-Week 7 W.O.
-10.1 App notes
ABSENT
AGENDA
EXT:
DUE DATE:
DW: 10.1 App Notes
----------------------------------------------------------------------------------------------------------------
SEMINAR 2:
-NA
BEFORE/AFTER SCHOOL:
DW- 10.1 Reading Questions
EXIT: Fill in your level of understanding AND Explain the differences
between mitosis and meiosis.
TUESDAY
Tuesday: ___2__/__17___
OBJECTIVE…#_NA____
TOPIC:
•Q: What is a homologous
chromosome?
•A:
Meiosis
Daily Work Grade- 10.1 Reading Questions
DW GRADE:
DO NOW
2 1 0
Today’s Objectives
7---DESCRIBE / RECOGNIZE the events of each stage of meiosis
8---EXPLAIN the reduction of chromosome number that occurs during meiosis
9---EXPLAIN the importance of meiosis in providing genetic variation
Vocabulary
-meiosis
-gene
-homologous chromosome
-gamete
-haploid / diploid
-fertilization
-crossing over / synapsis
These should be
done by test day!
Things to think about…
-Missing work
-Absent work
Many quizzes and labs need to be made up
9.2 ONION ROOT LAB
8
9.2 ONION ROOT LAB
9
9.2 ONION ROOT LAB
10
CONCLUSION
Interphase
Stages Blend
Mitosis begins -Nucleolus/Nuclear
Membrane disappear
Centrioles Appear
Spindle Fibers form
Chromatids attach to S.F
-Line up down the middle
Chromatids Separate
2 New nuclei form
Mitosis Ends
2 New nuclei form ready for cytokinesis
Maintenance of Chromosome/Repair & Replace
11
HOMOLOGOUS SHOES
10.1 Reading Questions
1. What happens to the number of chromosomes
during meiosis?
-they reduce by 1/2
10.1 Reading Questions
2. Circle a pair of homologous chromosomes.
10.1 Reading Questions
3. How many chromosomes are in a human gamete?
-b. 23
10.1 Reading Questions
4. Circle the part of each chromosome that was
swapped during crossing over.
10.1 Reading Questions
5. During what phase does the chromosome number
reduced from 2n to n?
-Anaphase I
10.1 Reading Questions
6. In the space provided, write the chromosome
number (2n or n) for each phase.
10.1 Reading Questions
7. List the phase in which the sister chromatids are
pulled apart.
-Anaphase II
10.1 Reading Questions
8. Why are the two phases of meiosis important for
gamete formation?
-In order to produce 4 different haploid cells
10.1 Reading Questions
9. Summarize the video clip.
Visualizing Meiosis
10.1 Reading Questions
10. Fill in the blanks in the table with the number of
daughter cells provided.
10.1 Reading Questions
11. Underline the haploid daughter cells.
10.1 Reading Questions
12. How is the chromosome inheritance different in
sexual reproduction?
-half of an organisms chromosomes are inherited
from each parent
10.1 Application Notes
chromosome
Homologous Chromosome
HOMOLOGOUS
CHROMOSOMES
Synapsed pair of homologous
chromosomes
What does crossing over look like?
Crossing Over between homologous chromosomes
Pool noodles represent chromatids in the classroom.
Locke J , and McDermid H E Genetics 2005;170:5-6
EXIT
FILL-IN: level of understanding of today’s objective

EXIT: Explain the differences
between mitosis and meiosis.