SI Ch 11-14 2010 - Chapter 12 Binary Fission- how bacteria...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 12 Binary Fission- how bacteria dvide (not how humans divide) Somatic cells- Body cells diploid 2n= 46 chromosomes. They use mitosis (not meiosis) Gametes- Sex cells Haploid n=23 Uses meiosis. Cell cycle Interphase G1- cells get bigger. Restriction points (restricts whether the cell can continue) S- DNA synthesis G2- Checks DNA errors G0- cell hops into this phase if damaged, tries to fix. suicide if cant. no division. Some cells are permanently in this phase, such as nerve cells or brain cells Cell check points are G1, G2 and M Cell chemicals- signal the cell to divide Kinase- Phosphorilate Cyclin- When high (concentration of chemicals) the cell divides. Centromeres hold the chromosome together. Two sticks are sister chromotids, they make up the
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
chromosome. When they split apart they become daughter chromosomes. MAD Gene- signals that the spindle is attached to the centromere. Happens in metaphase 2^n rule- n=# of chromosomes. 2^n is the genetic variation. Kinetochore- region on the centromere where spindles attach. Telomere- Located at the end of chromosome. Non coded region. They get shorter as we age
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

SI Ch 11-14 2010 - Chapter 12 Binary Fission- how bacteria...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online