Sts Bio p 4 10.14.10

AGENDA:

- Go over this weekends home work

and important due dates and assignments

- Go over yesterday’s lab

- Assign Scriber =[

-Lab ( follow up from previous cell lab)

HOMEWORK:

- Lab questions, UP-49-51

- Cancer research due 10/25

-UP page 1-3 review TEST IS WED! STUDY!

DON'T DO 10-15 on review

- ( Notes on Defusion Osmosis will be given on Monday 10/18)

IN CLASS:

As class started, we discussed homework, and Thursday's lab if you missed that you can look over Fox’s wonderful scribe. We were told that in the Review for the test Wed. we should do page 1 of the UP and we will not have to do #10-15. Notes on defusion osmosis will be given on Monday 10/18. Cancer research project due on 10/25 ( on whatever cancer you chose)

After we went over the bulk of homework, we were introduced to a follow up cell lab. which was an exciting part of a Friday:) this lab is a very helpful lab to understanding the life cycle of a cell in reproduction. This lab really helps in study which helps you understand which phase is critical for a cell to go through and what changes take place and most importantly HOW LONG DO THE CELLS STAY IN A PHASE.

LAB:

In this lab we:

-use onion root tip cells to locate cells in Mitosis and Interphase

- count number of cells in Mitosis and Interphase

-find lenght of time ( in minutes) needed to complete each phase

-compare data of time needed to complete each phase with those of normal cells, to abnormal cancerous cells

Matrials used:

- microscope

- prepared onion root tip slide

- UP pages 48-51 to record data

Procedure:

Part 1

1-Focus slide under microscope.

2- under low power first view cells in mitosis then high power

3-count and record number of cells in each miotic phase ( prophase, metaphase, anaphase, and telophase) and interphase

4- move the slide to view new area

count and record data of number cells in each phase

5- repeat in third new area

6-total the number of cells counted in each phase

7- find the sum of in total of cells observed and counted in all in this lab

Part 2 - determining th time required for phase

1- number of cells in a phase is an indication of the time spent in that phase in miosis

time spent ininterpahse and miosis can be calculated if total timeof miosis is known. fro an onion root it is 720 minutes (12 hrs)

- formula to use : { time for a phase= # of cells in a phase / (divided) total # of cells in total x 720 mins.

Ex. if you have 109 in metaphase and 980 cells in total the 109/980 x 720 = 80mins.

^ the onion root cells basically looked similar to this and you had to identify whih phase the were in.

After you finish taking data :

answer the analysis questions

and compare cancer cell to the normal cells

these all can be found in UP 48-51

That is basically how class ended with finishing the lab. so study , and finish lab, and review in UP=]

I dont know who “ Destiny” choses ... i dont think there is anyone left .....=]