University:
Kentucky State University
Course:
BIO 301 | Human Anatomy
Academic year:

2024
Views:

500

Pages:

7
Author:

iwanankgfd

AMOEBA SISTERS: Meiosis Helpful Notes How we reduce from 46 to 23 chromosomes. Meiosis is a reduction process. This is how we produce 4 haploid gamete cells (eggs and sperm). Amoeba sisters MEIOSIS Must duplicate the genetic information b4 division 92 divided by 4=23 23 23 Apx. same size and contain the same genes Amoeba sisters MEIOSIS Chromosomes swap genetic information = variation Metaphase chromosomes line up in the middle. M1 is below… you can see the tetrads (4) line up: homologous pairs. Wrong # of chromosomes in each resulting cell after division. 6.6 Meiosis and Genetic Variation Cross·ng over dur·ng n,eios·s ·ncreases genetic divers·ty. • Cross·ng, over is the exchang e of chromosome segments between homolog,ous chromosomes - occurs during prophase I of me·osis ii results in new combinations of g enes 1 1 1 Crossing over exchanges segments of DNA between homologous chromosomes. Two homologous chromosomes pair up with each other during prophas-e I in meios·s. In this position some chromatids are very dos to each other and segmen s cross. Some of these segments break off and reattach to the other homologous chromosome. Syn h s·ze Draw the four chromosomes that would result after the above chromosomes go through meiosis. A human karyotype depicting 23 homologous pairs of chromosomes. Meiosis Mitosis vs. Meiosis • Using the diagram on the right compare the similarities and differences between Meiosis and Mitosis.