Bellwork

Why would cells need to divide to create new cells?

Cell Division

The Cell Cycle

Intro

Cells go through a series of events known as the cell cycleo During this cycle, the

cell grows, prepares for division, and divides to form two daughter cells• Each daughter cell

moves into a new cell cycle of activity

Target #14- I can describe how a prokaryote cell replicates

Prokaryote cell cycleo A form of reproduction

known as binary fission• Once the chromosome is

replicated, the two DNA molecules attach to different regions of the cell membrane• Fibers in the cell stretch the

cell apart• The fibers pinch the center in• Divides the cytoplasm and copied

DNA into two new cells

Target #15- I can describe how a eukaryote cell replicates

The eukaryote cell cycle occurs in several stageso Interphase

• Consists of 3 parts• Gap 1, Synthesis, and

Gap 2

o M Phase• Cell division

o The length of the cell cycle in eukaryotes varies between types of cells

Target #16- I can describe the stage of Interphase

Interphaseo The longest stage of

the cell cycleo A time when the cell

carries on its usual functions• Dependent on location

in the bodyo Gets ready to divideo Consists of three

parts• Gap1, Synthesis, Gap 2

Checking for Understanding

What are the 3 phases of interphase?

Target #17- I can state what occurs at each phase of interphase

Gap 1 (G1) Undergoes significant

growtho doubles its organelleso Makes new proteins

Accumulates the materials needed for DNA synthesiso Includes building

enzymes, nucleotides,

Synthesis DNA replication

occurso Each chromosome

is composed of one coiled DNA

o A single chromatid is replicated into two sister chromatids

Target #17- cont.

Gap 2 Shortest of the three

phases of interphase Production of

organelles needed for cell division are producedo Spindle fibers form

• Made of microtubules

o Centriole• Assists in the

separation of sister chromatids

Target #18- I can explain what occurs at M Phase of the cell cycle

M Phase- Cell divisionoFollows interphaseoProduces two daughter cells• Identical to each other

o Usually takes place quickly in comparison to interphase

o Can be divided into two phases• Mitosis- division of the nucleus• Cytokinesis- division of the cytoplasm

Checking for Understanding

What is the end result after a cell goes through the entire cell cycle?