Class Notes (836,136)
Canada (509,645)
BIOL1010 (3)
Cheryl (3)

Meiosis, Fighting Cancer

4 Pages
Unlock Document

Health Sciences

Meiosis, Mutations, & Fighting Cancer Fighting Cancer • Multiple mutations are needed for more cancers to occur, usually happening over a lifetime by: • Errors in replication • Carcinogens – radiation, chemicals, etc. • Free radicals – ionized particles that can steal electrons from stable molecules • Contagious Cancer: HPV, Tasmanian Devil • Finding and fighting cancer: biopsy, excess protein, and chemotherapy, radiation Proto-oncogenes • Genes involved in cell cycle regulation • Become oncogenes when cancerous Tumor suppressors • Stop cell division if something is wrong • Can fix DNA Meiosis • Without meiosis the number of chromosomes passing on to zygote would be out of control Allele • • • Homologue • • • Gamete • • • Diploid • • • Haploid • • • Chromosome 1. Chromosomal deletions mutations 2. Chromosomal duplication 3. Chromosomal inversion 4. Chromosomal translocation Aneuploidy • Too many or too few chromosomes, caused by nondisjunction  something goes wrong during meiosis (anaphase I or II), if a zygote ends up missing a chromosome = monosomy, if I zygote ends up with an extra chromosome = polysomy • Some conditions are: Down’s Syndrome (3 of chromosome 21), Klinefelter Syndrome (XXY), Turner Syndrome (X) Polyploidy • If nondisjunction happens in 3 or more chromosomes Triploid • Abnormal  humans: 23 + 23 + 23 = 69 (3n), very rare in animals, happens in plants Diploid • Normal  23 + 23 = 46 (2n) Haploid • Normal sex cell
More Less

Related notes for BIOL1010

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.