Transcript Cell Cycle
Warm-Up #16 1/25/13 1) Label pictures A, B, C with the type of DNA it is. A C B 2) If an organism has 24 chromosomes in its body cells, how many would it have in its gametes? 3) How many chromosomes would be in that organisms skin cells? 4) Which cell will divide soon, 5:1 or 8:1 ? 5) Which cell is bigger, 15:1 or 10:1 ? Warm-Up # 17 1/28/13 1) What is the picture showing? 2) How many cells are created during mitosis and are they identical or different? 3) How many cells are created during mitosis and are they identical or different? 4) What is the chromosome difference between a cell created in mitosis versus one created in meiosis? 5) What are the 3 main parts of the cell cycle? Sexual Vs. Asexual Reproduction, Basics of Cancer Essential Question What is the difference between cancer cells and normal body cells? Mitosis (Body/Somatic cells) Vs. Meiosis (Sex/ Gamete Cells) 2 cells are produced 4 cells are produced Cells are genetically identical Cells are genetically different Diploid cells (2N) Haploid cells (N) How asexually reproducing organisms produce a new organism How sexually reproducing organisms produce gametes Sexual Vs. Asexual Reproduction Oh my goodness, she said sex! 2 methods of reproduction Most multicellular organisms reproduce sexually Sexual – 2 cells, 1 from each parent, unite to form the first cell (ZYGOTE) of the new organism Asexual – new organism has a single parent Sexual Reproduction 2 individuals produce offspring that have genetic characteristics from both parents. Occurs due to gamete formation and fertilization. Results in new gene combinations in a population The successful sperm Asexual Reproduction Three main types Fission (budding) Fragmentation Regeneration Fragmentation The body of the parent breaks into pieces, each of which can produce an offspring. Ex. Planarians (a type of worm) Fission AKA budding One or more individuals are formed from the original The offspring grows out of the body of the parent Can remain attached or break away Example: hydra Multiple buds on a hydra Hydra showing a bud and a newly formed organism A single Hydra Regeneration These animals can lose a body part, and can grow a replacement part. The lost part can regenerate into an entirely new organism. Two lost rays producing 3 rays Ex. sea stars Lost ray producing 5 rays Sporulation Division of spores Reproduction involving specialized cells coming from bacteria Cell Cycle Cells have different cycle lengths. Nerve cells do not divide in an adult – long cell cycle Skin and digestive cells divide throughout our lives – short cell cycle Cyclins - group of proteins in eukaryotic cells that help control the timing of the cell cycle. Cancer is often caused due to a particular cyclin functioning improperly. Cancer… What is It Exactly? Uncontrolled cell growth = CANCER. Cancer cells do not stop dividing when they should. This forms tumors. Tumors cause damage to nearby healthy tissue. Benign Tumors = Do not spread in body Malignant Tumors= Cancer cells Normal cell activities are disrupted. The whole body suffers. Benign vs. Malignant More likely to be harmless; usually don’t spread. Cancer cells that spread through the body. More likely to cause harm or death. Cancer Cells Cancer Cells Among Red Blood Cells Start of a Tumor Leukemia Rat with a tumor Unit 6 Folder Check - Wednesday You will get the rubric for the folder TODAY You can turn it in tomorrow for 10 points extra credit You should have: 19 warm ups 4 days of notes Vocab Cards Cell Cycle Diagram and Meiosis Diagram Review sheet in front pocket Grade stuff in back pocket Warm-Up # 15 1/24/13 1) What is a somatic cell? 2) Why does meiosis have 2 divisions? 3) Females do not create 4 eggs during each meiosis, what do they create? 4) What part of meiosis is this picture?