Chromosomes Sex cells contain half the number of chromosomes as body cells (all of the other cells in a multicellular organism). Human body cells have.

Slides:

Advertisements

Similar presentations

Meiosis and Sexual Reproduction

Advertisements

Heredity Chapter Eight: Reproduction Chapter Nine: Heredity Chapter Ten: The Code of Life.

Reproduction in Protists. GPS and EQ GPS.07.SC.C.S7L3.b. - Compare and contrast that organisms reproduce asexually and sexually (bacteria, protists, fungi,

Chromosome Number - Is how many chromosomes a cell has

Meiosis Notes CP Biology Ms. Morrison. Chromosome Number  Every organism gets half of chromosomes from one parent and half from the other parent  Two.

The Cell Cycle & Cell Division

Meiosis Division of Sex Cells. Meiosis  A process of reduction division in which the number of chromosomes per cell is cut in half through the separation.

MEIOSIS By Diana Bivens. Meiosis vs. Mitosis Mitosis: period of nuclear division in which two daughter cells are formed, each identical to the parent.

Sexual Reproduction During sexual reproduction, two sex cells, sometimes called an egg and a sperm, come together. Sex cells are formed from cells in reproductive.

 Gametes – sex cells  Gametes fuse  fertilization  zygote  Gametes are formed by meiosis  Somatic cells – all other cells but sexual cells  Every.

Sexual Reproduction Meiosis.

What is meiosis? The process of dividing the number of chromosomes in cells used for reproduction.

11-4 Meiosis I. Chromosome Number A. Homologous- corresponding chromosomes, one from the male and one from the female. B. Diploid - A cell that contains.

Genetics Lecture II Meiosis The formation of gametes aka. Gametogenesis.

Meiosis Stages. Agenda: Cell Cycle using Mitosis & Meiosis Learning Target: I can describe the role of genes and chromosomes in the process of cell reproduction,

Sexual Reproduction During sexual reproduction, two sex cells, sometimes called an egg and a sperm, come together. Sex cells are formed from cells in.

MEIOSIS Chapter Meiosis  This kind of cell division produces gametes containing half the number of chromosomes as a parent’s body cell  Meiosis.

Part 1 Sexual Reproduction and Meiosis Two types of reproduction Asexual reproduction is reproduction that requires only one parent. Most single-celled.

“He learned all about genetics at school today.”.

Meiosis November Chromosome Number Diploid- 2 sets of chromosomes –In somatic (body) cells; One comes from mother and one from father –Also referred.

Meiosis – the formation of sex cells

Meiosis Unit 4.

Page # Name Date Points My Points 82 Notes 8.1 2/ Notes 8.2

Meiosis Division of Sex Cells.

Review Chromosome Patterns

Do Now ● Do Now ● Do Now Write down the following questions in your journal. Answer each question in complete sentences. 1.) List the phases of the cell.

H. Meiosis 1. Meiosis is a form of cell division that doubles the steps of mitosis and forms eggs and sperm. PMAT P2M2A2T2 The female produces an egg.

Meiosis Modified by Liz LaRosa 2011.

Meiosis How Gametes Have Only Half the Number of Chromosomes As Other Cells Modified by Liz LaRosa 2011.

Lesson 5.5: Meiosis.

46 chromosomes (diploid)

You have body cells and gametes.

You have body cells and gametes.

KEY CONCEPT Gametes have half the number of chromosomes that body cells have.

You have body cells and gametes.

You have body cells and gametes.

You have body cells and gametes.

Genes & Chromosomes Organisms have tens of thousands of genes that determine individual traits Genes are lined up on chromosomes A thousand or more genes.

Meiosis Division of Sex Cells.

Meiosis I results in 2 haploid daughter cells

Meiosis Modified by Liz LaRosa 2011.

Warm Up 1/27-28/15 Draw Anaphase

Meiosis Division of Sex Cells.

Meiosis How to make SEX cells!.

Mitosis and Meiosis Year 10 Biology.

Sexual Reproduction & Meiosis

You have body cells and gametes.

You have body cells and gametes.

You have body cells and gametes.

You have body cells and gametes.

You have body cells and gametes.

You have body cells and gametes.

Meiosis Phases.

You have body cells and gametes.

Meiosis & Sexual Reproduction

You have body cells and gametes.

Meiosis Division of Sex Cells.

Human chromosomes Humans have 23 pairs of chromosomes (or total of 46 chromosomes)

Meiosis Modified by Liz LaRosa 2011 *.

You have body cells and gametes.

Meiosis Division of Sex Cells.

You have body cells and gametes.

Chromosomes and Meiosis

You have body cells and gametes.

Presentation transcript:

Chromosomes Sex cells contain half the number of chromosomes as body cells (all of the other cells in a multicellular organism). Human body cells have 46 chromosomes. Human sex cells have 23 chromosomes.

Chromosomes Meiosis is cell division that produces sex cells with half the number of chromosomes. For humans that is 23

What happens in meiosis? The events in meiosis Chromosomes double/thicken Nuclear membrane disappears. Homologous (pairs) chromosomes line up a the cell’s center. Spindle fibers attach. Nuclear membrane reforms. Two cells form that are identical and diploid.

What happens in meiosis? In the second division, the chromosomes do not double. Chromosomes thicken and line up at cell’s center. Spindle fibers attach. Chromosomes are pulled to opposite side of cell by spindle fibers. Four new cells form when the nuclear membranes reform and cells separate. The four new cells are unique and haploid so they have half the number of chromosomes compared to starting cells.

Diploid, haploid and fertilization Complete set of chromosomes is called a diploid set. Half set of chromosomes is called a haploid set. Most animal cells have a diploid set of chromosomes except in sex cells (SPERM AND EGG)