t opic 1: c ell b iology 1.6 cell division sd41.k12.id.us

TOPIC 1: CELL BIOLOGY1.6 Cell division

sd41.k12.id.us

1 - INTERPHASERead & Consider 1.6.4-1.6.5

• What do you know?• What questions do you have?• Based on the graphic above, how much of a

cell’s life is spent in interphase?

INTERPHASE

The cell carries out specialized functions as well as several metabolic reactions. It consists of three phases: Gap 1 (G1), Synthesis (S), and Gap 2 (G2). Interphase Activities:

Active cytoplasm of a growing cellNew organelles formed (mitochondria, chloroplasts, etc.

Enzymes produced for S phaseDNA is copiedIncrease in histone production.Increase in microtubule production.

INTERPHASE

CYC

LIN

S – C

ON

TR

OLLIN

G T

HE C

ELL

CYC

LE

Cyclins are proteins that interact with CDKs (cyclin-dependent kinase) to form enzymes that control cell cycle.

2 - MITOSISRead & Consider 1.6.1-1.6.3

• What do you know?• What questions do you have?• What is the result of mitosis?

DNA TERMINOLOGY

Chromosome/Chromatid – single DNA molecule

Sister chromatid – two identical DNA molecules attached by a centromere This attachment helps to organize genetic material

within the cell.

ORGANIZING DNA

MITOSIS & CYTOKINESIS

Mitosis: division of the nucleus followed by cytokinesis, the division of the cytoplasm.

1. Describe, in detail, the events of each phase of mitosis.

2. Draw a labeled diagram of each phase.Hoover.k12.al.us

PROPHASE

METAPHASE

ANAPHASE

TELOPHASE

CYTOKINESIS

In a plant cell.

Draw a graph to indicate the amount of DNA in a cell over time.

DN

A

Time

CELL CYCLE STAGE IDENTIFICATION

ONION ROOT – MITOTIC INDEX

 You will classify each cell based on what

phase it is in. At the end you will count up the cells found in each

phase and use those numbers to determine

the mitotic index = % of cells found in mitosis.

3 - CANCERRead & Consider 1.6.6

• What do you know?• What questions do you have?• How has your life been impacted by cancer?

TUMORS

Primary Tumor – tumor found in the original tissue.

Secondary Tumor – tumor that has migrated to other tissues via metastasis.

Breast cancer tumor – hyscience.comCancer Behavior

CAUSES

They can occur in any tissue. Triggered by:MutagensOncogenes

SMOKING & CANCER

WORKS CITED "Cancer Cell Has Potential On-off Switch - Medicure

Medical Travels LLP." Medicure Medical Travels LLP. N.p., n.d. Web. 01 Aug. 2014.

C, Cindy. "Anatomy & Physiology 2401 Kandeh Flashcards The Stages of the Cell Cycle | StudyBlue." StudyBlue. N.p., 14 Feb. 2013. Web. 31 July 2014.

"Mitosis." BiologyEOC -. N.p., n.d. Web. 31 July 2014. "Onion Root Tip (Allium) Showing Cells in Various Stages

of Mitosis. LM X100." - 42-29390593. Corbis Images, n.d. Web. 01 Aug. 2014.

Piatt. "Mitosis Phases and Cell Cycle - Chapter 8 Matching." Quia -. Chilarol Area High School, n.d. Web. 31 July 2014.

Walpole, Benda. Biology for the IB Diploma. Second ed. United Kingdom: Cambridge UP, 2014. Print.