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Meiosis I: Replication
Interphase I DNA Replication DNA Replication Chromatin a ball of yarn Chromatin a ball of yarn
Prophase I Chromosomes coil and condense Chromosomes coil and condense Form a tetrad (synapsis) Form a tetrad (synapsis)
Metaphase I Tetrads align along equator Tetrads align along equator
Anaphase I Tetrads split Tetrads split Form dyads Form dyads Dyads move to opposite poles Dyads move to opposite poles
Telophase I Cleavage furrow forms Cleavage furrow forms Cell splits (cytokinesis) Cell splits (cytokinesis) Form two diploid daughter cells Form two diploid daughter cells
Meiosis II: Reduction Division
Interkinesis Similar to Interphase I Similar to Interphase I No DNA replication No DNA replication
Prophase II Chromosomes condense and coil Chromosomes condense and coil
Metaphase II Chromosomes align along equator Chromosomes align along equator
Anaphase II Dyads split at centromere Dyads split at centromere Chromatids move to opposite poles Chromatids move to opposite poles
Telophase II Cleavage Cleavage furrow forms furrow forms Cell splits Cell splits Both diploid Both diploid cell splits cell splits Forms 4 haploid daughter cells Forms 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.
MEIOSIS. Two successive nuclear divisions occur, Meiosis I (Reduction) and Meiosis II (Division). Two successive nuclear divisions occur, Meiosis I.
Asexual Reproduction. Fission Budding Fragmentation & Regeneration.
Meiosis Review. Meiosis reduces the number of chromosome sets from diploid to haploid Like mitosis, meiosis is preceded by the replication of chromosomes.
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 2n = 6 double stranded 2n = 6 single stranded Preparing for meiosis 1st step of meiosis – Duplication of DNA – Why bother?
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.
Mitosis & Meiosis. Chromosome Structure Chromatin – Thin, uncoiled strands of DNA & proteins (histones) Chromosomes – Rod-shaped structures composed.
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. INTERPHASE : G 1 - cell growth, the longest part of the cell’s life S – DNA synthesis, DNA is copied (replication) G 2 – cell prepares.
Reduction of Chromosomes. Mitosis Cell duplication (or reproduction) where one cell creates two genetically identical daughter cells Cellular reproduction,
Honors Biology Spring With a neighbor, discuss the following: What is meiosis? How does it differ from mitosis?
Chromosomal basis of inheritance cell division – mitosis and meiosis.
Meiosis Sex cell (gamete) division= egg and sperm Sex cell (gamete) division= egg and sperm Products= 4 cells all genetically different Products= 4 cells.
Meiosis What is Meiosis? A division of the nucleus that reduces chromosome number by half. Important in sexual reproduction Involves combining the genetic.
03_37 Mitosis and cytokinesis Slide number: 1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Early interphase.
MITOSIS MEIOSIS Parent cell (2n) Figure 9.17 Mitosis and Meiosis: A Comparison.
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.
Homologous: term used to refer to chromosomes that each have corresponding chromosome from opposite-sex parent › Example: Your # 12 chromosome from.
Meiosis and Sexual Reproduction. Meiosis Reduction/Division Reduction: Process takes a ______ cell with two sets of chromosomes and reduces it to a _________.
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.
Meiosis. Meiosis A type of cell division that produces four cells each with half the number of chromosomes as the parents Homologous Chromosomes: Two.
Aim: Why is meiosis important? Do Now: Label each phase of cell division (IPMATC)
GAMETE PRODUCTION IN SEXUAL REPRODUCTION MEIOSIS.
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. Meiosis – A Source of Distinction Ever wonder why you don’t look exactly like either your mother or father?
Unit 4 Cell Division. The rate at which wastes are produced depends on a cell’s….. or As a cell becomes larger, which increases faster??? Therefore, cells.
Cell Cycle IPMATC. Cell Cycle 3 Parts: – Interphase – Mitosis Prophase Metaphase Anaphase Telophase – Cytokinesis.
Objectives 1) Name three parts of the cell cycle. 2) Name four major parts of mitosis. 3) Identify important parts of a dividing cell.
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,
Cell Division. Cell division – parent cell divides into 2 daughter cells 2 types of cell division: 1) mitosis – division of somatic (body) cell to produce.
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