Warm up:Go over questions from lab.

HW: Short quiz on DNA terms-see end of notesFinal Draft Lab Report-Due Friday

Anticipation Guide

Cell Growth● Information needed for cell growth found in

DNA● Cell grows until it gets too large for DNA to

handle, then divides

When a cell divides, does it just split in two?

NO!● a cell must copy its DNA

first(otherwise each daughter cell will not have a complete set of the parent cell’s genetic information)

Cell Division○ Cell Division has two stages:

■ Mitosis: division of the cell nucleus

■ Cytokinesis: division of the cytoplasm

● Mitosis is considered asexual reproduction because each daughter cell is genetically identical to the parent cell

How is DNA transferred?■ DNA is transferred from one

generation to the next in

eukaryotic cells in the form of chromosomes

DNA looks like this in a cell that is not dividing (chromatin)

■ Each species has a specific number of chromosomes

■ Chromosomes are only visible during cell division

Chromosomes are...

■ made up of tightly packed DNA and proteins■ Draw chromosome in notes

Chromosomes continued...■ consist of two identical sister chromatids

■ label the chromatids on your diagram and color them different colors

■ sister chromatids are identical copies of each other-

meaning they have the exact same genetic information

■ in this way, when the cell divides, each daughter cell gets

one sister chromatid from the parent chromosome

and still has all the same genetic information

● each pair of chromatids are attached at the centromere near the middle (label on drawing)

Two Types of ReproductionAsexual Reproduction● One parent● Offspring genetically

identical● Usually done by single

celled organisms

Sexual Reproduction● Two parents● Offspring a

combination of both parents genetic information

● Usually done by more complex organisms

Are cells constantly dividing?● No!● Interphase is the “in-between”

period of growth between divisions

● during this time the DNA is in the form of chromatin enclosed by the nuclear envelope or membrane

● draw and label chromatin and the nuclear envelope

nuclear envelope

Chromatin

○ The cell cycle is the series of events that cells go through as they grow and divide

○ ***Key concept: during the cell cycle a cell grows,

prepares for division, and divides to form two

daughter cells, each of which then begins the cycle again

Turn to page 281 and fill in the different phases of the cell cycle and what each one does

Cell Growth

Prep for mitosis

Based on your diagram, do cells spend more time in interphase or mitosis?

Some cells get stuck in interphase-nerve cells

Some cells never stop dividing-can be good or bad

Matching:A. InterphaseB. MitosisC. Cytokinesis

___-Nuclear Division___-Cytoplasm Splits___-Period of Growth

Anticipation Guide Part 2