Download Fly Meiosis FlyMeiosis2016_2

FlyMeiosis17.notebook
February 28, 2017
QOD­2/23/17
1. How much genetic information is each parent responsible for?
2. Is the genetic information the same for males and females?
3. Will offspring always look like their parents?
Learning Target(LT): I can describe and model the process of meiosis in which egg and sperm cells are formed.(State standard 9­11 LS1I)
May 26­10:47 AM
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Put title of activity in TOC Fly Meiosis
Activity Qs: How are gametes (sex cells) formed? How does sexual reproduction lead to genetic variation?
Sep 2­1:50 PM
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FlyMeiosis17.notebook
February 28, 2017
Do Now­2/24/17
1. If an organism has 36 chromosomes, how many chromosomes will be in each of its gametes (sex cells)?
2. What stage of cell division do you think this cell is in?
Learning Target(LT): I can describe and model the process of meiosis in which egg and sperm cells are formed.(State standard 9­11 LS1I)
May 26­10:47 AM
Do Now­2/27/17
1. What is the difference between haploid and diploid cells?
2. What stage of cell division do you think this cell is in?
Learning Target(LT): I can describe and model the process of meiosis in which egg and sperm cells are formed.(State standard 9­11 LS1I)
May 26­10:47 AM
2
FlyMeiosis17.notebook
February 28, 2017
Evidence Collection:
Pre­work: Comparing Mitosis to Meiosis­ reading and questions (~25 minutes, if you don't finish, complete as HW)
As a class: 1. Watch short video on meiosis: add to reading
At lab station:
2­6. Follow instructions in your handout: using the directions on the sticky notes
Put descriptions on the SIDE of circles, draw chromosomes IN the circles
7. Draw chromosomes on notes page­ add alleles (letters) r
R
to notes.
8­12. Make fly offspring (you do this 4x­ at least 1 per person)­ complete Analysis
13. Answer Analysis questions­on back.
May 10­8:17 AM
Offspring #1: EXAMPLE
From you From another group
Alleles: p G r x p g R
Determined by dice roll
Genotype after mating:
p p G g
R r
Phenotype: what fly looks like
rounded wings, white wings, red eyes
To save time, only make ONE fly card per person‐ roll dice to determine which offspring you will do.
Feb 27­9:21 AM
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FlyMeiosis17.notebook
February 28, 2017
Do Now­2/28/17
1. Using your activity key, what would be the genotype and phenotype for the following cross pgr x PgR 2. What stage of cell division do you think this cell is in?
Learning Target(LT): I can describe how gametes are formed and how meiosis leads to increased genetic variation.
May 26­10:47 AM
Do Now­2/28/17
1. Using your activity key, what would be the genotype and phenotype for the following cross pgr x PgR PpggRr
pointed, spotted wings and red eyes
2. What stage of cell division do you think this cell is in?
Telophase
Learning Target(LT): I can describe how gametes are formed and how meiosis leads to increased genetic variation.
May 26­10:47 AM
4
FlyMeiosis17.notebook
February 28, 2017
Red pen revision/addition(only write what you need!)
Each human has 46 chromosomes, 23 from the female, 23 from the male. The corresponding chromosomes are said to be homologous. (22 autosomes, 1 sex chromosome) You are modeling only 3 pairs.
Look at Vocabulary:
Diploid (2N)­ a cell that contains both sets of homologous chromosomes (all the genetic info)
Gametes (sex cells) have only one set of chromosomes (half the genetic info,) considered haploid (N)
Haploid gametes are produced in meiosis: look at your diagram from activity and add notations/descriptions if needed.
Jun 1­2:58 PM
What has to happen before meiosis I? Double copies of chromosomes are made (2 homologous pairs) in the S phase of interphase
Then we go to Meiosis I­
Prophase I­ same processes as mitosis
Haploid or diploid?
Crossing over occurs, produces new gene combinations (p. 504)­ does not happen in mitosis!
Metaphase I
Jun 1­3:14 PM
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FlyMeiosis17.notebook
February 28, 2017
Anaphase I
Telophase I (not on diagram)
Haploid or diploid?
Cell divides, each new cell has 1 homologous pair, from either mom or dad (technically N)
Jun 1­3:16 PM
Meiosis II
Cells undergo another division cycle Metaphase II
Anaphase II
Telophase II (not on diagram)
Haploid or diploid?
Jun 1­3:24 PM
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FlyMeiosis17.notebook
February 28, 2017
Each new cell has a single copy of the haploid (N) number of chromosomes
Gametes: In males, all haploid gametes become sperm cells
Notice how each gamete is unique!
In females, only one haploid gamete will become an egg, the meiosis web link
rest are called polar bodies Glue/tape diagram in notebook.
Turn in packet and fly after analysis is complete.
Still have questions about Meiosis? Go to the LINKS page on my SWIFT site under Bio:Heredity & Inheritance
Jun 1­3:26 PM
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