![Page 1: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/1.jpg)
Meiosis
2n n
![Page 2: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/2.jpg)
Definition
Meiosis is a process that produces new cells with half the usual number of chromosomes.
New cells are called sex cells– Gametes (sperm and egg cells)
![Page 3: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/3.jpg)
Sex Cells Sex cells have
only 1/2 the number of chromosomes. 1 chromosome from each pair.
![Page 4: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/4.jpg)
Human body cells have 46 chromosomes (23 pairs). The chromosomes in each pair are called homologous. Homologous chromosomes are usually the same size and shape.
Homologous Chromosomes
![Page 5: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/5.jpg)
![Page 6: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/6.jpg)
Each pair contains 1 chromosome donated by the mother and one donated by the father.
![Page 7: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/7.jpg)
Homologues Share Genes
A homologous pair of chromosomes contain all of the same genes.– Homologous pairs may contain
different versions of genes called alleles.
![Page 8: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/8.jpg)
Why is it important that sex cells have half the usual
number of chromosomes?
When two gametes fuse, each parent donates 1/2 of a homologous pair of chromosomes.
offspring will receive a normal number of chromosomes in each body cell. Half from each parent.
![Page 9: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/9.jpg)
Meiosis is cell division similar to Mitosis. In mitosis, chromosomes are copied once, then the nucleus divides once.
![Page 10: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/10.jpg)
In Meiosis the chromosomes are copied once, then the nucleus divides twice.
![Page 11: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/11.jpg)
![Page 12: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/12.jpg)
Homologues are
During Meiosis, one of each chromosome pair (homologues) ends up in a sex cell.
![Page 13: Meiosis - Grosse Pointe Public Schools...Definition Meiosis is a process that produces new cells with half the usual number of chromosomes. New cells are called sex cells – Gametes](https://reader034.vdocuments.net/reader034/viewer/2022042805/5f60536d8bcd982d795c5ed4/html5/thumbnails/13.jpg)
What is the function (purpose) of meiosis?