WARM-UP#7 What type of cell division is the diagram above? What phase of cell division the arrow pointing to?

Characteristics of living things REMEMBER THE… Characteristics of living things Living things are made up of cells Unicellular – one celled organisms Multicellular – many celled organisms

Characteristics of living things Living things reproduce to make offspring of the same species Sexual reproduction Asexual reproduction

Characteristics of living things Living things grow and develop

MEIOSIS PROCESS OF REDUCTION DIVISION (CHOROMOSOME # IS CUT IN ½ BY SEPERATION OF HOMOLOGOUS CHROMOSOMES IN DIPLOID CELLS)

Chromosome number in body cells vs. gametes? Diploid (2N) - have 2 sets Gametes: Haploid (N) - have 1 set

Summarize the events of meiosis. (See also #5)

Summarize the events of meiosis. (See also #5)

What are the results of meiosis? 4 haploid (N) cells Genetically different from each other & the original cell

Differences between Mitosis & Meiosis? MITOSIS produces 2 identical diploid (2N) cells MEIOSIS produces 4 different haploid (N) cells

Human cells 2N=46. How many chromosomes are in a…? Sperm Cell? 23 chromosomes Gamete is haploid (N) Egg Cell? White Blood Cell? 46 chromosomes Body cell is diploid (2N)

How does independent assortment apply to chromosomes? The “chromosomes” assort independently, not individual “genes”

Crossing-over & gene mapping? Farther apart 2 genes are, more likely they’ll be separated Frequency of crossing-over = to distance between 2 genes library.thinkquest.org/ 19037/genome3.html

How close are 2 usually independently assorted genes? Very far apart from each other.

biology.clc.uc.edu/ courses/bio104/meiomito.htm

MEIOSIS FOLDABLE

? Any Questions???