Meiosis Formation of gametes.

Slides:

Advertisements

Similar presentations

AQA Biology AS Level Unit 2

Advertisements

Figure 13.7 Overview of meiosis: how meiosis reduces chromosome number

3.3 Meiosis Alleles segregate during meiosis allowing new combinations to be formed by the fusion of gametes.

Meiosis Sex cell (gamete) division= egg and sperm

Unit 3 Part II – The Cell.  A form of cell division happening in sexually reproducing organisms.  Consists of 2 consecutive cell divisions (meiosis.

Meiosis (3.3) IB Diploma Biology Essential Idea: Meiosis produces genetically-varied, haploid cells needed for sexual reproduction.

Meiosis. II. What is meiosis? Meiosis is a process in which the number of chromosomes per cell is cut in half through the separation of homologous chromosomes.

Meiosis Animation. Meiosis A second type of cell division designed to make haploid cells called gametes Gametes include sperm and egg Meiosis occurs in.

Chapter 8 Cell Reproduction. Chapter overview 3 SECTIONS: SECTION 1CHROMOSOMES SECTION 2CELL DIVISION SECTION 3MEIOSIS.

Meiosis Topics 4.2 and Assessment Statements 4.2.1State that meiosis is a reduction division of a diploid nucleus to form haploid nuclei Define.

Meiosis and Genetic Variation Review Sections 6.1, 6.2, and

Chromosome structure. Chromosomes Example - an organism is 2n = 4. Chromosomes 1 & 2 are homologous chromosomes Chromosomes 3 & 4 are homologous chromosomes.

Genetic Variation Meiosis reduces the number of chromosomes and produces haploid cells from diploid cells.

Topics: 3 & & 10.1 Meiosis. 1 – Meiosis Preparation Read & Consider Understandings & What is the difference between meiosis.

MEIOSIS 3.3. Today’s Class Focus on gamete production (meiosis) and how cells go from being diploid to haploid Curriculum – 3.3 U1 One diploid nucleus.

Bellwork Draw this in your notes and fill in the phases of mitosis.

Meiosis “Reduction Division”. Reduce the number of chromosomes by half Produce haploid cells (1 set of chromosomes) 2N → N Produce gametes (egg or sperm)

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.

Meiosis IB Biology. Meiosis – cell division for the production of gametes (sperm or egg or spores) Called “reduction division” because it divides the.

Meiosis The ability to pass on traits is called heredity. – This ability is one of the unifying themes of biology as individual units of heredity (genes)

MEIOSIS 3.3 & Meiosis: A reduction division of a diploid nucleus to form four haploid nuclei. This allows for a sexual life cycle in living organisms.

The Cell Cycle Mitosis and Meiosis Cancer. Why do cells reproduce??  Cell theory Pt. II  Agar Lab  Repair and Growth  GrowthQuest  Reproduction.

Meiosis Animation.

Meiosis EQ: How is meiosis different from mitosis?

Meiosis Review.

Stages of Meiosis.

Meiosis Unit 11 continues….

Meiosis Overview video.

Meiosis and Sexual Lifecycles

2 divisions of the nucleus

MEIOSIS I and II FORMATIVE QUIZ

Cell Division: Meiosis

Cell Reproduction Chapter 6.

Cell Reproduction Centrioles Spindle Fibers Stem Cell G1 Phase

Meiosis Subtopic 3.3.

MEIOSIS Topic 4.2 IB Biology Miss Werba.

Meiosis Meiosis: Process of reduction division in which the number of chromosomes per cell is cut in half through the separation of homologous chromosomes.

Meiosis Topics 4.2 and 10.1.

Submit your karyotype activity sheet. Feedback distributer: Sabrina

MEIOSIS The Power of Reduction.

3.3 Meiosis Alleles segregate during meiosis allowing new combinations to be formed by the fusion of gametes.

MEIOSIS Topic 3.3 IB Biology Miss Werba

REVISION: MEIOSIS Topic 4.2 IB Biology Miss Werba.

What are these, and which process creates them?

Meiosis Chapter 10.1.

Meiosis and Sexual Reproduction

Meiosis I results in 2 haploid daughter cells

Comparing Mitosis and Meiosis

Meiosis and Sexual Reproduction

Meiosis 3.3 & 10.1.

Meiosis – a form of cell division that halves the number of chromosomes when forming reproductive cells, such as gametes (egg & sperm cells)

Phases of Meiosis Chapter 10.2.

Cell Division! Created by Educational Technology Network

What are the two main phases of the cell cycle?

10.1 Meiosis Meiosis leads to independent assortment of chromosomes and unique composition of alleles in daughter cells.

11.2 Meiosis I. What Happens During Meiosis

Section 3-1 Meiosis.

Meiosis SC Standard B4.5- The student will be able to summarize the characteristics of the phases of Meiosis I and II.

Meiosis Division of Sex Cells.

Meiosis Practice Test.

Presentation transcript:

Meiosis Formation of gametes

Meiosis Results Gametes Haploid v diploid Genetic variation

Meiosis DNA replication and chromosome replication still happen in interphase Two divisions Same stage names as mitosis Meiosis I – reduction Meiosis II – similar to mitosis

Meiosis I Homologous chromosomes Crossing over (prophase I) Chiasma

Meiosis I Independent Assortment

Genetic Variation Crossing over Independent assortment Fusion of gametes Haploid  diploid

Stages (135-136) Draw each stage of meiosis explain each The following terms should be used when appropriate Homologous chromosomes Centromere Spindle fibers Sister chromatids Nucleus Crossing over Chiasma

Nondisjunction

Nondisjunction

Karyotype

Karyotypes Chorionic villus sampling Amniocentesis Small sample of the placenta is taken 11th – 13th week of pregnancy Amniocentesis A sample of the amniotic fluid (surrounds fetus) is taken 3 - .5% chance of miscarriage when in the 2nd trimester Can be done at 12-14 weeks but there is an increased risk of miscarriage

Karyotypes