Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Unit 4 --Bellwork #3 • 1. Explain at least two ways in which mitosis and meiosis are different. • 2. Why do sperm and egg have only 23 chromosomes? • 3. The haploid number of a species is 22. What is its diploid number? • 4. What are gametes? • 5. In meiosis, the final result in females is one _______ and three ____________. Cell division controls, cancer and chromosome number Notes Cell division controls • Cells grown in lab will grow across petri dish until they touch another cell or the edges • Cyclin is a protein that regulates cell growth • Other proteins control the steps of cell cycle thus control growth How cancer relates to mitosis • Cancer is the uncontrolled division of cells • Cancerous cells do not respond to normal growth controls, grow until all food is gone • Thought to be caused by changes in genes controlling mitosis • Form masses of tissues called tumors • Can be caused by smoking, pollution, radiation, some viruses and some are inherited Compare diploid and haploid number • Diploid: cell that contains two of each kind of chromosome (2N) • Body cells are diploid • Body cells are called Somatic Cells • Haploid: cell with only one kind of chromosome (N) • Gametes (sex cells) are haploid Unit 4 – Quiz #3 1. What is the uncontrolled growth of cells called? a. cancer b. cyclin c. mutation 2. If cells stop growing when the touch other cells they are ______ cells. a. cancerous b. mutated c. normal 3. Body cells contain 2N number of chromosomes. They are ? a. diploid b. haploid 4. Sex cells contain N number of chromosomes. They are ? a. diploid b. haploid 5. A plant has 40 chromosomes in the body cells. How many would be in the sex cells? a. 20 b. 40 c. 80 Part 2 Quiz – Next Class • Mitosis: identify pictures of each phase, explain what is happening, name cell cycle steps in correct order (IPMATC) • Meiosis: explain what happens, what you end up with, diploid/haploid • Cancer: what happens in the cell • SA#1: Differences between Meiosis & Mitosis (chart to fill in) • SA#2: Causes of cancer