WARM-UP#7

1. What type of cell division is the diagram above?

2. What phase of cell division the arrow pointing to?

Characteristics of Characteristics of living thingsliving things

Living things are made up Living things are made up of of cellscells

UnicellularUnicellular – – oneone celled celled organismsorganisms

MulticellularMulticellular – – manymany celled organismscelled organisms

REMEMBER THE…REMEMBER THE…

Characteristics of living thingsCharacteristics of living things

Living things Living things reproducereproduce to make to make offspring of the same offspring of the same speciesspecies

Sexual reproduction

Asexual reproduction

Characteristics of living thingsCharacteristics of living things

Living things Living things grow and developgrow and develop

MEIOSISMEIOSIS PROCESS OF REDUCTION DIVISION

(CHOROMOSOME # IS CUT IN ½ BY SEPERATION OF HOMOLOGOUS CHROMOSOMES IN DIPLOID CELLS)

2.2. Chromosome number in Chromosome number in body cells vs. gametes?body cells vs. gametes?

Body CellsBody Cells::

Diploid (2N) - have 2 setsDiploid (2N) - have 2 sets

GametesGametes::

Haploid (N) - have 1 setHaploid (N) - have 1 set

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

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

44 haploidhaploid (N) cells (N) cells

GeneticallyGenetically different from different from each other & the each other & the original celloriginal cell

4.4. What are the results of What are the results of meiosis?meiosis?

6.6. Differences between Mitosis & Meiosis?Differences between Mitosis & Meiosis? MITOSISMITOSIS produces produces 22 identical identical diploiddiploid (2N) cells (2N) cells

MEIOSISMEIOSIS produces produces 44 different different haploidhaploid (N) cells (N) cells

Sperm Cell?Sperm Cell?23 chromosomes23 chromosomesGamete is haploid (N)Gamete is haploid (N)

Egg Cell?Egg Cell?23 chromosomes23 chromosomesGamete is haploid (N)Gamete is haploid (N)

White Blood Cell?White Blood Cell?46 chromosomes46 chromosomesBody cell is diploid (2N)Body cell is diploid (2N)

7.7. Human cells 2N=46.Human cells 2N=46.How many chromosomes are in a…?How many chromosomes are in a…?

The “chromosomes” The “chromosomes” assort independently, assort independently, not individual “genes”not individual “genes”

8.8. How does independent assortment How does independent assortment apply to chromosomes?apply to chromosomes?

Farther apart 2 Farther apart 2 genes are, more genes are, more likely they’ll be likely they’ll be separatedseparated

Frequency of Frequency of crossing-over = to crossing-over = to distance between 2 distance between 2 genesgenes

9.9. Crossing-over & gene mapping?Crossing-over & gene mapping?

library.thinkquest.org/ 19037/genome3.html

Very far apart from each other.Very far apart from each other.

10.10. How close are 2 usually How close are 2 usually independently assorted genes?independently assorted genes?

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

MEIOSIS FOLDABLEMEIOSIS FOLDABLE