4.2 Overview of Photosynthesis Set up Cornell Notes on pg. 61 Topic: 5.2 Mitosis and Cytokinesis Essential Question: 1. Explain why the daughter cells.

4.2 Overview of Photosynthesis•Set up Cornell Notes on pg. 61

•Topic: 5.2 Mitosis and Cytokinesis

•Essential Question:

1. Explain why the daughter cells resulting from mitosis are genetically identical to each other and to the original cell?

2.1 Atoms, Ions, and Molecules

5.2 Mitosis and Cytokinesis

1. Explain why the daughter cells resulting from mitosis are genetically identical to each other and to the original cell?

Key concept: Cells divide during mitosis and cytokinesis

5.2 Mitosis and Cytokinesis

KEY CONCEPT Cells divide during mitosis and cytokinesis.

5.2 Mitosis and Cytokinesis

• Cells must receive a full set of DNA (no more, no less) to work properly

5.2 Mitosis and Cytokinesis

• DNA- double stranded molecule made of four different subunits of nucleotides (A,T,C,G)

• Chromosome- one long continuous thread of DNA– Each body cell has 46

chromosomes in 23 pairs

5.2 Mitosis and Cytokinesis

Chromosomes condense at the start of mitosis.

• DNA wraps around proteins (histones) that condense it.

DNA doublehelix

DNA andhistones

Chromatin SupercoiledDNA

5.2 Mitosis and Cytokinesis

• One half of a duplicated chromosome is a chromatid.

• Sister chromatids are held together at the centromere.

• Telomeres protect DNA and do not include genes.

Old DNA New DNAPg. 60

5.2 Mitosis and Cytokinesis

Centromere

Chromosome

Telomere

Sister Chromatid

5.2 Mitosis and Cytokinesis

Process of Meiosis Video

5.2 Mitosis and Cytokinesis

Classwork

• On the provided paper:– Please create a flow map of The Cell Cycle

TITLE of Phase

PICTURE

(with color)

• Description of what is happening (in bullets)

Pg. 140-141 in book

Please include:•Interphase•Prophase•Metaphase•Anaphase•Telophase•Cytokinesis

mitosis

5.2 Mitosis and Cytokinesis

Parent cell

centrioles

spindle fibers

centrosome

nucleus withDNA

• Interphase prepares the cell to divide (G1, S, G2)– During interphase, the DNA is duplicated.

*Not part of mitosis

5.2 Mitosis and Cytokinesis

• Mitosis divides a Somatic (body) cell’s nucleus in four phases.

– Prophase: chromosomes condense and spindle fibers form.

5.2 Mitosis and Cytokinesis

– Metaphase: chromosomes line up in the middle of the cell.

5.2 Mitosis and Cytokinesis

– Anaphase: sister chromatids separate to opposite sides of the cell.

5.2 Mitosis and Cytokinesis

– Telophase: the new nuclei form and chromosomes begin to uncoil.

5.2 Mitosis and Cytokinesis

• Cytokinesis differs in animal and plant cells.

– In animal cells, the membrane pinches closed.

– In plant cells, a cell plate forms.

5.2 Mitosis and Cytokinesis

How can you remember what goes first?

Peter

Made

A

Tiger

Cry

5.2 Mitosis and Cytokinesis

Mitosis and Cytokinesis Video (9m37-21m)

5.2 Mitosis and Cytokinesis

Tip to Remember

• Mitosis = Mi “TOE” sis– A toe is part of your body

– MITOSIS only occurs in your Somatic or BODY cells- Every cell EXCEPT sperm and eggs

5.2 Mitosis and Cytokinesis

Cell Cycle Poster Activity

Please draw and explain the part that your group was assigned. Be prepared to share out with the class.

•Cell Cycle (5.1)•Interphase•Prophase•Metaphase•Anaphase•Telophase•Cytokinesis

TOPIC

PICTURE

Explanation

5.3 Regulation of the Cell Cycle

Briefly explain why the daughter cells resulting from mitosis are genetically identical to each other and to the original cell.

5.3 Regulation of the Cell Cycle

During Interphase the original cell is preparing for cell division by duplicating (copying) its DNA.

During mitosis the chromosomes are split, resulting in 2 nuclei with identical DNA.

During cytokinesis the cell fully separates leaving us with two identical daughter cells.

5.3 Regulation of the Cell Cycle

Interphase: (G1, S, G2)

6.1 Chromosomes and Meiosis

Sponge 1: Please correctly identify the phase of mitosis.

1 2

3 4

6.1 Chromosomes and Meiosis

Sponge 1: Please correctly identify the phase of mitosis.

Telophase Anaphase

Metaphase Prophase