BYS201_Study_Guide_ch_7__8.6_

BYS201_Study_Guide_ch_7__8.6_ - BYS201 Cell Division and...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: BYS201 Cell Division and Regulation Modes of cell division: Binary fission in prokaryotes Happens ~every 30 minutes Chromosome in nucleoid (DNA + histones) highly packed. DNA replicates first before cell divides. In uncondensed form DNA is much larger than the cell dimensions. Cell division in Eukaryotes: DNA replicates first before cell divides. Highly regulated and controlled by many proteins. Two types of cell division mitosis and meiosis 1 Mitosis = Chromosome number is maintained Meiosis = Chromosome number is halved Cell division in eukaryotes is a staged process. The cells cycle between the two stages mitosis and interphase. Interphase is divided into 3 sub stages, G1, S and G2. Phases of cell cycle: G1 Phase - Cells stay in Go (G1) phase until they are activated to go into cell division by external factors. External factors such as growth factors stimulate production of Cyclin proteins (Cyclin D; Cyclin A; Cyclin E). Cyclin D then activates pRb which is bound to E2F by phosphorylation. E2F is released and activates several genes involve din DNA replication. 2 Most animal cells have G1 phase last 12-24 h. Nerve cells may stay in G o for years. Embryonic cells have almost no G1 phase. Early embryonic cells could finish the cell cycle in less than 8 min. 3 S Phase In cultured animal cells lasts ~ 8h At the end of S phase both DNA and somatic contents of the cell are ready to divide....
View Full Document

This note was uploaded on 11/07/2011 for the course BYS 201 taught by Professor Podila during the Spring '09 term at University of Alabama - Huntsville.

Page1 / 14

BYS201_Study_Guide_ch_7__8.6_ - BYS201 Cell Division and...

This preview shows document pages 1 - 5. Sign up to view the full document.

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