1 / 8

Meiosis

Meiosis. Chapter 6, section 3 Pgs. 188-191. How many chromosomes are in cells?. Different species have different numbers of chromosomes in their cells I.e. humans have 46, or 23 pairs. What are homologous chromosomes?.

senona
Download Presentation

Meiosis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Meiosis Chapter 6, section 3 Pgs. 188-191

  2. How many chromosomes are in cells? • Different species have different numbers of chromosomes in their cells • I.e. humans have 46, or 23 pairs

  3. What are homologous chromosomes? • Homologous chromosomes have the same sequence of genes and the same structure • They “match” gene for gene, but their alleles might be different

  4. What role do chromosomes play in reproduction? • Diploid cells have homologous chromosomes • Sex cells are haploid, they only have half • Male sex cells = sperm • Female sex cells = egg • When they join they create a diploid cell.

  5. What is meiosis? • Meiosis is a process in cell division where the number of chromosomes reduces to half the starting number when the nucleus divides twice. • It makes sex cells (sperm and egg)

  6. What are the steps of meiosis? • Chromosomes copied • Chromosomes line up • Homologous pairs separate • Cell divides • Chromosomes line up again • Chromatids pull apart • Membranes re-from around individual chromatids forming sex cells

  7. How does meiosis explain Mendel’s results? • The creation of sex cells explains how Mendel’s plants were able to reproduce offspring with heterozygous genotypes

  8. How is meiosis involved in inheritance? • Sex cells combine in order to produce offspring • Half of the genetic material comes from mom and half from dad

More Related