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Biology 120 notes (chapter 11: genetic and molecular biology; meiosis)

by: Jamisha Evans

Biology 120 notes (chapter 11: genetic and molecular biology; meiosis) BIO 120

Marketplace > Western Kentucky University > Biology > BIO 120 > Biology 120 notes chapter 11 genetic and molecular biology meiosis
Jamisha Evans
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About this Document

An overview of meiosis is included in these notes
Sahi, Shivendra
Class Notes
BIO120, BIO120, genetic, genetic, and, and, moleculer, moleculer, Biology, Biology
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This 2 page Class Notes was uploaded by Jamisha Evans on Sunday April 17, 2016. The Class Notes belongs to BIO 120 at Western Kentucky University taught by Sahi, Shivendra in Winter 2016. Since its upload, it has received 15 views. For similar materials see BIOL CONC CELLS METAB GENETICS in Biology at Western Kentucky University.


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Date Created: 04/17/16
Biology 120 Notes (Genetic and Molecular Biology: Chapter 11)  An overview of meiosis  Meiosis reduces chromosome number by half which is why it is called reduction division  Just before meiosis begins, each chromosome in the diploid (2n) parent cell is replicated  After replication, each chromosome consists of identical sister chromatids attached at the centromere.  Meiosis consists of two cell divisions (meiosis I and meiosis II)  Meiosis I  Diploid parent cell produces two haploid daughter cells  Homologs in each chromosome pair separate and go to different daughter cells  Although the daughter cells are haploid (n) each chromosome still consist of two identical sister chromatids  No replication (S phase) after meiosis I (between meiosis I and II)  Meiosis II  The sister chromatid of each chromosome separate and go to different daughter cells  Meiosis II is similar to meiosis II  The four haploid daughter cells produced by meiosis II also have one of each type of chromosome, but now the chromosomes are replicated  Remember: there is no replication between meiosis I and meiosis II. Replication only occurs before meiosis I during Interphase.  In meiosis chromosomes are reduced from 2n to n (diploid to haploid)  In animals, the diploid daughter cells that comes from the haploid original cell, becomes gametes through a process called gametogenesis.  Fertilization  Fertilization results in a diploid zygote  When two haploid gametes fuse during fertilization, a full complement of chromosomes is restored.  The cell that results from fertilization is diploid (zygote 2n)  Each diploid individual receives a haploid chromosome set from both its mother (maternal chromosomes) and its father (paternal chromosomes)  Phases of meiosis  Interphase- DNA replication/synthesis  Meiosis I: separation of homologous chromosomes  Prophase I  Metaphase I  Anaphase I  Telophase I  Meiosis II: separation of sister chromatids (like mitosis)  Prophase II  Metaphase II  Anaphase II  Telophase II **Same names just different roman murals (I and II)***


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