Genetics Review DNA (Deoxyribonucleic Acid): Stored inside chromosomes and contain all instructions for life It is made up of Ribose (sugar)‚ phosphate‚ and when of 4 Nitrogenous bases (Adenine‚ Thymine‚ Guanine and Cytosine) A Nucleotide consists of a Phosphate molecule‚ a sugar molecule‚ and a Nitrogenous base pair The nitrogenous bases always pair up AT and CG Each human has 46 chromosomes 23 pairs in total 1 pair sex chromosomes (that define your sex‚ male XX‚ female XY) 22
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Gene Mapping in Ascospore Sordaria Cultures by Recombination Abstract The laboratory experiment demonstrates the process of meiosis using the Sordaria Fimicola fungi. Meiosis is important because it is the process that generates diversity in genetics. A wildtype was crossed with two mutant types: tan and grey. In order to exhibit recombination‚ the sequence of ascospores needed to result in a 2:2:2:2 or 2:4:2 sequence. From the crossover
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NATIONAL SENIOR CERTIFICATE GRADE 12 LIFE SCIENCES P1 VERSION 2 (OLD CONTENT) FOR PART-TIME CANDIDATES NOVEMBER 2011 FINAL MEMORANDUM – 24/11/11 MARKS: 150 This memorandum consists of 12 pages. Copyright reserved Please turn over Life Sciences/P1 (Version 2) (Part-time) 2 NSC – Memorandum DBE/November 2011 PRINCIPLES RELATED TO MARKING LIFE SCIENCES 2011 1. If more information than marks allocated is given Stop marking when maximum marks is reached and put a wavy line and ’max’ in the
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Exercise 13 MITOSIS: REPLICATION OF EUKARYOTIC CELLS ANSWERS TO QUESTIONS 1. a. Mitosis and cytokinesis are often referred to collectively as "cellular division." Why are they more accurately called cellular replication? The result of mitosis is production of two cells (replicates) identical to the parent cell. The genetic material is replicated rather than divided. b. Does the cell cycle have a beginning and an end? The organization of our study of cellular events indicates a beginning and
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Meiosis Review Worksheet Pledge: _____1. If the sperm cell of a fruit fly has 4 chromosomes‚ then the number of chromosomes in each body cell is: a. 2 b. 4 c. 6 d. 8 e. 16 _____2. Of the following cells‚ the only one to have the haploid number of chromosomes is: a) skin b)muscle c) nerve d) connective e) ovum _____3. The diploid number is restored as a result of: a) differentiation
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Meiosis How does sexual reproduction lead to genetic variation? Why? Cells reproduce through mitosis to make exact copies of the original cell. This is done for growth and repair. Sexually-reproducing organisms have a second form of cell division that produces reproductive cells with half the number of chromosomes. This process is called meiosis‚ and without it‚ humans‚ oak trees‚ beetles‚ and all other sexually-reproducing organisms would be vastly different than they are today. Model
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Republic of the Philippines NUEVA ECIJA UNIVERSITY OF SCIENCE AND TECHNOLOGY San Isidro campus‚ San Isidro‚ Nueva Ecija FEASIBILITY OF UBE AS BASED FOR ESPASOL MAKING In Partial Fulfilment of the Requirement in Science Technology and Society Mr. Reynante Bustillos GENERAL SCIENCE MAJOR: abegail cabalar BSE- ll March 2013 i Acknowledgement We wish to convey our nearest appreciation to the following person
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Mutation Variation of organisms occurs from linkages and crossing over. The Independent Assortment of Random Fusion of gametes also creates variation. Mutation will occur and new gametes or alter existing ones. What is mutation? Mutation is a permanent alteration of a genomic sequence. It may be divided into two categories: 1) Point/ Gene Mutation 2) Chromosomal Mutation Mutations may either be advantageous or disadvantageous and are not all inherently negative Point/ Gene Mutation
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Study Guide for Exam 3 This will be a terminology-heavy exam. Make sure to study definitions. Compare your tables to a couple of classmates’ tables. Be familiar with life cycles as indicated. Do qs listed on Moodle –both the exam forum III and qs I’ve posted with power points Focus on the power point lectures‚ posted Remember‚ this is only a guide. Use your class notes‚ textbook‚ and all materials on Moodle General comments: The format of this exam MAY include fill in the blank‚ diagrams
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ECO EVO Study Guide Major Themes: Darwin’s Postulate 1. Heritable variation – (genotype) models of 1-3 loci‚ usually 2 alleles‚ produce heritable phenotypes 2. Organisms engage in a struggle for existence – per capita growth rates from survival and reproduction 3. Heritable traits influence outcome of the struggle – variation affects the struggle; phenotypes (determined by genotypes) influence per capita growth rates 3 Big Questions Biologists seek to answer: 1. Diversity
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