mitosis. think about this… what is this? what is cancer?? what are some causes? what are some...
TRANSCRIPT
Think About This… What is this? What IS cancer?? What are some causes? What are some reasons for cell division? How do you think a cell would accomplish
this task?
SO WHY LEARN ABOUT CELL DIVISION??
Growth Cancer- uncontrolled growth Cells have given life spans; need to
replace! Lining of esophagus 2-3 days Lining of small intestine 1-2 days Skin 2-4 weeks
Stem Cells
All Cells Come From Cells One concept of the cell theory we just
learned about! All organisms reproduce their own kind…
Asexual Reproduction Sexual Reproduction
Types of Cell Division We Will Learn About
Mitosis- Division of somatic cells (body cells)
Meiosis- Creation of gametes (sex cells)
Lab- You Are a 19th Century Cell Biologist In this lab, you will assume the role of a biologist
in the mid-1890s. You are fascinated by the power of the microscope to reveal the inner workings of living cells. The invention of the compound microscope, along with new stains, make it possible for you to see cell structures that no one has ever seen before. You plan to collaborate with your colleagues to discover the events of cell division.
Lab- You Are a 19th Century Cell Biologist
Things you know right now: 1) The cell has many organelles. 2) The nucleus seems to be pretty important. 3) There seem to be “structures” inside the
nucleus that undergo changes during cell division (chromosomes).
Lab- You Are a 19th Century Cell Biologist
1) Obtain a microscope and a slide of onion root tip.
2) Focus under low power.
Lab- You Are a 19th Century Cell Biologist 4) Select one cell whose chromosomes are
clearly visible & sketch in the box. 5) Look around and select 4 other cells whose
internal appearances are different and sketch them as well.
6) Try and place your sketches in order from 1-5.
7) Check your answers with Mrs. Romano… how many did you get right??
Lab- You Are a 19th Century Cell Biologist
8) Identify the phases of cell division. 9) Count the number of cells in your slide in
each stage of cell division. 10) Answer the analysis questions.
Review- Cell Parts TERMS TO KNOW:
Nucleus Nuclear envelope Centriole Spindle Fiber Chromatin Chromatid Chromosome Centromere
Do All Cells Divide?? NO!! Muscles, neurons, red blood cells, white
blood cells generally DO NOT go through mitosis.
Cell Cycle Orderly sequence of
cell division INTERPHASE- Cell
grows, DNA replicates, gets ready to divide; LONG
MITOSIS (cell divides) 4 parts
MIATOSIS- Step 4 of 4 Telophase- Chromosomes reach ends;
nuclear envelope reforms; cytoplasm divides (CYTOKINESIS)
Metastasis Most dangerous property of cancer cells is
their ability to spread beyond their original site
Detection Visual Radiation Imaging (spot glows under UV
light) Biological or chemical test (spot changes
color when exposed to a chemical)
Causes Getting older Genetics Tobacco UV radiation (sunlight) X-rays Certain chemicals
(asbestos, vinyl chloride, nickel)
Certain viruses/ bacteria (HPV, Hepatitis C, HIV)
Certain hormones (excess estrogen)
Alcohol Poor diet/ lack of
exercise