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Meiosis

2n n

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)

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

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

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

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

Homologues Share Genes

A homologous pair of chromosomes contain all of the same genes.– Homologous pairs may contain

different versions of genes called alleles.

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

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

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

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

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

What is the function (purpose) of meiosis?

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Meiosis - tiu.edu.iq · Meiosis is the process by which ”gametes” (sex cells) , with half the number of chromosomes, are produced. During Meiosis diploid cells are reduced to

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At sexual maturity, the ovaries and testes produce haploid gametes Gametes are the only types of human cells produced by meiosis, rather than mitosis Meiosis

What Are Gametes? - Amherst College11... · What Are Gametes? •Gametes –mature form of cells set aside which will undergo meiosis and contribute a haploid ... –small, motility

Meiosis. Somatic cells undergo Mitosis Gametes or sex cells undergo meiosis, resulting in a cell with half of the usual number of chromosomes (compared

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Overview of Meiosis - Anoka-Hennepin School District 11 · Meiosis is a form of cell division that leads to the production of gametes. gametes: egg cells and sperm cells -contain

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