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Meiosis I: Replication
Interphase I DNA Replication Chromatin a “ball of yarn”
Prophase I Chromosomes coil and condense Form a tetrad (synapsis)
Metaphase I Tetrads align along equator
Anaphase I Tetrads split Form dyads Dyads move to opposite poles
Telophase I Cleavage furrow forms Cell splits (cytokinesis)Form two diploid daughter cells
Meiosis II: Reduction Division
Interkinesis Similar to Interphase I No DNA replication
Prophase II Chromosomes condense and coil
Metaphase II Chromosomes align along equator
Anaphase II Dyads split at centromereChromatids move to opposite poles
Telophase II Cleavage furrow forms Cell splits Both diploidForms 4 haploid daughter cells
Meiosis What does this picture tell us about meiosis? How is the purpose of meiosis different from the purpose of mitosis?
MitosisMeiosis Start Diploid End DiploidHaploid
Meiosis. Meiosis is a form of cell division where diploid body cells make haploid gametes. In humans, this means cells that have 46 chromosomes (2N) divide.
10.6 Meiosis I in an animal cell Slide number: 1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Homologous.
Asexual Reproduction. Fission Budding Fragmentation & Regeneration.
Meiosis “Reduction Division”. Reduce the number of chromosomes by half Produce haploid cells (1 set of chromosomes) 2N → N Produce gametes (egg or sperm)
Lesson 9.3: Meiosis: The Life Cycle of Sex Cells Goals: Identify male and female gametes Compare chromosome numbers between somatic cells and gametes.
AP Biology Lecture #23 Meiosis.
Meiosis. Meiosis is a special type of cell division that occurs only in reproductive organs. Meiosis makes reproductive cells called gametes (egg or.
Chapter 10 Sexual Reproduction & Genetics Part 1: Meiosis.
MEIOSIS AND SEXUAL REPRODUCTION. Meiosis Process of nuclear division that reduces the number of chromosomes in a cell by half 2 STAGES Meiosis I: Homologous.
©2000 Timothy G. Standish Meiosis Gamete Production Timothy G. Standish, Ph. D.
The Cell Cycle.
Reduction of Chromosomes. Mitosis Cell duplication (or reproduction) where one cell creates two genetically identical daughter cells Cellular reproduction,
Meiosis Honors Biology Spring 2013.
Chromosomal basis of inheritance cell division – mitosis and meiosis.
Meiosis Sex cell (gamete) division= egg and sperm
03_37 Mitosis and cytokinesis Slide number: 1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Early interphase.
Parent cell (2n) MITOSIS MEIOSIS Parent cell (2n)
Meiosis Meiosis – M phase that occurs in the ovaries (females) or testes (males) of an organism to create gametes or sex cells Produces 4 haploid cells.
MEIOSIS chapter 11 section 4
Meiosis and Sexual Reproduction
Genetic Variation Meiosis reduces the number of chromosomes and produces haploid cells from diploid cells.
Objectives 1) Name three parts of the cell cycle. 2) Name four major parts of mitosis. 3) Identify important parts of a dividing cell. 4) Discuss important.
A form of nuclear cell division that creates 4 haploid cells from one diploid cell. This process occurs in the gametes (sex cells) Involves 2 rounds.
Cell Reproduction in Bacteria Binary Fission: asexual reproduction producing genetically identical cells.
Cell Division pg. 67 Cell life cycle - changes a cell goes through from when formed to division 1.Interphase - cell grows, metabolic activities 2.Cell.
Meiosis Cell Division. Meiosis – A Source of Distinction Why do you share some but not all characters of each parent? What are the rules of this sharing.
Meiosis. Now that you know all about DNA…. How is DNA passed from parent to offspring? How is DNA passed from parent to offspring? There are two main.
The cell cycle Mitosis is only one section of the life cycle of a cell. Interphase is the main part of the cell cycle. This is where DNA is replicated.
Meiosis is used in sexual reproduction to make genetically diverse gametes genetically diverse individuals.
MEIOSIS What is it? What is it? Making of gametes Making of gametes Sex Cells Sex Cells Sperm (pollen) in males Sperm (pollen) in males Eggs (ova) in females.
Cell Division: all cells come from pre- existing cells.
1. Name the phase. Diploid number is 4.. Metaphase II.
Aim: Why is meiosis important?
GAMETE PRODUCTION IN SEXUAL REPRODUCTION
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)
Lecture ??? Date ______ Chapter 12~ The Cell Cycle.
The Other Cell Division: Making Sex Cells
Unit 4 Cell Division REVIEW.
Cell Cycle IPMATC.
Objectives Name three parts of the cell cycle.
Youtube links to watch ZIfKlMhttp://www.youtube.com/watch?v=gwcwS ZIfKlM WjHQ4http://www.youtube.com/watch?v=lpAa4T.
Cell Division B-2.6 Summarize the characteristics of the cell cycle: interphase (called G1, S, G2); the phases of mitosis (called prophase, metaphase,
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