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ANSC 101 week 4 notes

by: Melinda Notetaker

ANSC 101 week 4 notes ANSC 101

Melinda Notetaker
CSU Chico
GPA 3.25

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About this Document

These notes cover Mitosis and Meiosis.
Introduction to Animal Science
Haydn Clement
Class Notes
ANSC 101, Introduction to Animal Science
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This 3 page Class Notes was uploaded by Melinda Notetaker on Wednesday February 17, 2016. The Class Notes belongs to ANSC 101 at California State University Chico taught by Haydn Clement in Spring 2016. Since its upload, it has received 24 views. For similar materials see Introduction to Animal Science in Agricultural & Resource Econ at California State University Chico.

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Date Created: 02/17/16
Week 4 Mitosis and Meiosis Cell Cycle: cell growth and division G1: cell grows, protein synthesis for division (9 hours) S phase: DNA synthesis phase, cell replicates DNA (2 chromatids) (2 hrs) G2: cell prepares for Mitosis (4 hrs) During synthesis phase of cycle: chromosome makes a mirror image or sister chromatid Interphase: everything in cell cycle except for mitosis Mitosis: responsible for organizing cell division, tissue repair and growth Prophase:  chromatin condense  Centrioles begin moving to opposite ends of cell  Fibers extend from centromeres: spindle apparatus Metaphase (middle):  Nuclear membranes dissolve  Centromeres attach to spindles  Chromosomes line up single file Anaphase (splitting up):  Chromosomes split at centromere and migrate to the poles  Each cell gets one copy of each chromosome Telophase (completely separated):  Chromosomes reach the pole, nuclear membrane is formed  Spindle fibers dispersed  Cell begins cytokinesis  Mitosis phase complete- cytokinesis complete (DRAW) Mitosis with 3 chromosomes Prophase Metaphase Anaphase Telophase Cattle have 60 chromosomes Humans have 46 Chromosomes! Meiosis Meiosis:  Only happens in the gonad (ovaries or testicles)  How we make sperm and oocytes (eggs) Meiosis vs Mitosis:  Meiosis o is 2 cell divisions o Reduction division 2n to 1n o Equational division –(similar to mitosis)  Mitosis o Genetically identical cells  Meiosis o Genetically variable cells  Meiosis 2 o Similar to mitosis (though different chromosome numbers) Meiosis  All cells are diploid (2n) from conception forward: o Mitosis creates more diploid cells  Meiosis creates gametes that are haploid (1n) chromosomes  Human germ cells go from 46 (2n) to 23 (1n) chromosomes as result of meiosis Meiosis 1  2n-1n dividing homologous chromosomes Homologue:  are “like” chromosomes 1 from mother 1 from father (each parent gives 23 different chromosomes)  Homologues code for the same traits you get 2 copies of gene- 1 from mom and 1 from dad Homologues: like chromosomes Gene loci: site of gene on chromosome Allele: one copy of the gene Gene pairs: two alleles  One from sire and one from dam that code for same trait Meiosis 1: in metaphase 1, homologues lie next to each other and then separate (Anaphase 1)  Key feature to tell mitosis and meiosis apart  Starts with 4 chromosomes Meiosis 2: Sister Chromatids split in anaphase  1 cell creates 4 cells  Ends with 2 chromatids each What leads to genetic diversity? 1. Crossing over (Prophase) 2. Independent assortment (Metaphase) Punnet Square: determine possible gametes and making the mating’s for offspring phenotype and genotype Must be able to draw Meiosis 1 & 2


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