Thursday, December 10, 2015 Day 2

ScienceStarters Sheet

1. Please have theseItems on your desk.

Notebook

Science Starter: Two Vocabulary words:1.Anaphase 2. Telephase

Agenda

1. Anaphase: • Centromeres split• Two chromatids separate• Each chromatid becomes a new chromosome.• New chromosomes move to opposite ends of cells.

• Cell stretches out as the opposite ends are pushed apart.

2. Telophase: • Chromosomes begin to stretch out.• New nuclear envelope forms around each region of the

chromosomes.

T.O.C. Update

• Page 81 12/11/15 Meiosis Notes

• Write Yellow writing in your notes

MEIOSIS

Meiosis is the type of:

•Cell division by which eggs and sperm are produced.

•One parent cell produces four daughter cells.

•Daughter cells have half the number of chromosomes found in the original parent cell

Meiosis

During meiosis, DNA replicates once, but the nucleus divides twice.

Meiosis IFirst division of meiosis

First Division of Meiosis• Same as the mitosis. • Cell divides into 2 cells with the same genetic

information

Prophase I

http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

Prophase I

http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

Metaphase I

http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

Telophase I

http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

Meiosis

Second Division of Meiosis

Second Division of Meiosis• Prophase 2: DNA does not replicate.

• Metaphase 2: Chromosomes line up at the center of the cell

• Anaphase 2: Centromeres divide and sister chromatids move separately to each pole.

• Telophase 2: Cell division is complete.

Four haploid daughter cells are formed.

Definition

• Haploid- Having a single set of unpaired chromosomes, as in a germ cell, such as an egg or sperm.

Prophase II

http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

Metaphase II

http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

Telophase II

http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

Meiosis

http://www.biosci.uga.edu/almanac/bio_103/notes/apr_3.html.

Meiosis Animation

http://www.rothamsted.bbsrc.ac.uk/notebook/courses/guide/movie/meiosis.htm

Differences in Mitosis & Meiosis

• Mitosis– Asexual– Cell divides once– Two daughter cells– Genetic information is

identical– Creates regular cells

• Meiosis– Sexual– Cell divides twice– Four haploid daughter

cells– Genetic information is

different– Only creates sex cells

• E.g. sperm and eggs

Comparison Animations

http://www.pbs.org/wgbh/nova/baby/divi_flash.html