OBJ: Given notes, video, activity sheet SWBAT explain the process of Mitosis with 70% accuracy.

BRING IN TEXTBOOKDN: Hand-in Human Fetal Development Lab and quiz scantron; Distribute Cells & Heredity TextbookVIDEO: Mitosis- The Amazing Cell Process

ACT: Introduction to Mitosis (Cell Division, Asexual Reproduction).Text, read p. 56-62, Complete Cell Division Booklet

HW: Complete Cell Division Booklet ;Work on Third Qtr Review Packet; Third Qtr Interim Exam Tuesday, March 31; Spring Break Assignment: Constructed Response Packet #1 due Thursday, April 9

Lesson Notes

Nucleus: membrane bound control center of cell containing X-shaped structures called chromosomes. Each chromosome consists of two chromatids held together by a centromere.

Chromosome: X-shaped structure consisting of a single DNA molecule.

DNA Molecule: consisting of genes, the “code of life”

Organism: ½ genes mom + ½ genes dad

MOM

DADYOU

HALFGENES

HALF GENES

Cell CycleInterphase: chromosomes can not be seen;

doubling of chromosomes; nuclear membrane present; 99% of cell life.

Prophase: spindle fibers form; chromosomes seen (randomly arranged).

Metaphase: chromosomes line up in the Middle, no nuclear membrane.

Anaphase: chromosomes move Apart (Away)

Telophase: Two joined cells; two nuclear membranes form

Cytokinesis: Two separated daughter cells form.

M ITOS IS

MitosisMitosis (Two Types):Cell Division:

growth (embryo, fetus, infancy → adulthood) and repair/maintanence of an organism

Asexual Reproduction (ex: bacteria, hydra, worms): simple life

one parentdaughter cells have identical genes compared to parent cell

parent to daughter cell same number of chromosomes

HYDRA

Cell Division (Mitosis)Interphase (99% Life)

Prophase, Metaphase,Anaphase, Telophase

2 minutes

Cytokinesis

46 92 Chromosomes

1st CELL DIVISION

Parent Cell

2 Daughter Cells

46 Chromosomes

46 Chromosomes

SAME, IDENTICAL

Doubles

MITOSIS

MEIOSIS

Me sisMeiosis:

Sexual Reproduction (ex: animals, angiosperms)

Two parents (male, female)

daughter cells are a mixture/combination of genes compared to parent cell (by crossover)

parent to daughter cell different number of chromosomes

Parent 2x chromosomes compared to daughter cells

Daughter half (½) chromosomes compared to parent cell

Male Sexual Reproduction (Meiosis)Interphase

(99% Life) Prophase,MetaphaseAnaphase, Telophase

2 minutes

Prophase,MetaphaseAnaphase, Telophase

2 minutes

46 92 Chromosomes

Doubles

Cytokinesis

23 Chromosomes

46 Chromosomes

46 Chromosomes

23

23

23

Parent Cell

4 Daughter CellsSex Cells/Gametes (sperm)MIXTURE,

COMBINATION

1st CELL DIVISION2ND CELL DIVISION

Female Sexual Reproduction (Meiosis)Interphase

(99% Life) Prophase,MetaphaseAnaphase, Telophase

2 minutes

Prophase,MetaphaseAnaphase, Telophase

2 minutes

46 92 Chromosomes

Doubles

Cytokinesis

23 Chromosomes

46 Chromosomes

46 Chromosomes

23

23

23

Parent Cell

4 Daughter CellsSex Cells/Gametes (egg, polar bodies)MIXTURE,

COMBINATION

1st CELL DIVISION2ND CELL DIVISION

1 Egg

3 polar bodies

Sexual Reproduction’s (Meiosis) Evolutionary Advantage

Organism (offspring):

½ alleles mom; ½ alleles dad

Mixture of our parents (our dominant traits are usually shown; only if both parents have recessive alleles

will trait be shown)

Variety (variation) allows the organism to be better adapted to a changing environment.