• 1. Riccia – Structure and Reproduction • Systematic position :Riccia belongs to the family Ricciaceae‚ order Marchantiales‚ class Hepaticopsida and division Bryophyta.The common Indian species are Riccia siliata‚ R. hitra‚ R. discolor‚ R. glauca‚ R. gangetica‚ R.melansspora‚ R. hirta‚ R. crystallina. Habitat or occurrence: The genus Riccia with about 200 species‚ is cosmopolitan in its distribution and commonly grows in moist soils especially during and after rains. Majority of the species are
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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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Genetics Paper Each human in the world is created both separate and unique. Although members of a family may possess common traits‚ each member has their own individuality. Genetics allows for a creation of a unique individual. Chromosomes‚ meiosis‚ and fertilization are essential parts of genetics vital to the development of a distinct organism. The effect of each allows for a world in which no human is equal. To begin‚ chromosomes in genetics plays a key role in individuality. In genetics
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non-identical copies of each of the twenty-three chromosomes. One copy is derived from the person’s mother and the other from the person’s father. Meiosis‚ on the other hand‚ occurs only in testis and ovary tissues‚ producing sperm and ova (eggs). The gametes that are produced by meiosis in humans are haploid‚ containing only one copy of each of the twenty-three chromosomes. Because of recombination and independent assortment of parental chromosomes‚ the daughter cells produced by meiosis are not genetically
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Coimisiún na Scrúduithe Stáit Scrúduithe Stáit State Examinations Commission State Examinations Commission Leaving Certificate 2012 Certificate 2012 Marking Scheme Scheme Biology Design and Communication Graphics Higher Level Introduction The marking scheme is a guide to awarding marks to candidates‟ answers. It is a concise and summarised guide and is constructed in a way to minimise its word content. Examiners must conform to this scheme and may not allow marks for answering outside
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The history of fruit flies is considered a tradition. Research of these flies initially entered labs 100 years ago. Thomas Hunt Morgan‚ who lived from 1866 to 1945‚ was the founder of drosophila genetics. Thomas preformed his research in Morgan lab at the Columbia University in 1910. Here was when they found a famous mutation‚ know as the white-eyed fly. Quite an accomplishment was this discovery‚ but the end of the 1980’s there were 3‚000+-recorded mutations. Now drosophila is very popular; so popular
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male parent has a corresponding chromosomes from the female parent. 2. Highlight the letter of each way to describe a diploid cell. a. 2N b. Contains two sets of homologous chromosomes c. Contains a single set of homologous chromosomes d. A gamete 3. Highlight the letter of the number of chromosomes in a haploid cell where 2n=8 . a. 8 b. 4 c. 2 d. 0 4. Is the following sentence true or false? The diploid cell that enters meiosis becomes 4 haploid cells at the end of meiosis.false 5
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INTRODUCTION “The human being… the most sophisticated‚ amazing and wondrous creation in this earth. If one would take a peek at what’s inside his human body‚ he’ll be amazed to see hundreds of bones‚ miles of blood vessels and trillions of cells‚ all working together so he could be healthy and in perfect shape. Each organ‚ each body part‚ each a miracle… Each a piece of evidence of God’s mighty providence.” This lesson familiarizes you with the principles and stages of human growth‚ maturation
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Biology‚ 7e (Campbell) Chapter 15: The Chromosomal Basis of Inheritance Chapter Questions 1) Chromosomes and genes share all of the following characteristics except that A) they are both present in pairs in all diploid cells. B) they both undergo segregation during meiosis. C) their copy numbers in the cell decrease after meiosis‚ and increase during fertilization. D) they are both copied during the S phase of the cell cycle. E) they both pair up with their homologues during
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meiosis II are identical to those of mitosis except that in meiosis II‚ the cells have the haploid number of chromosomes. Meiosis occurs only at certain times in the life cycle of sexually reproducing organisms. The function of meiosis is to provide gamete variation and to keep the chromosome number constant throughout generations. Mitosis is more common because it occurs in all tissues during embryonic development and also during growth and repair. The function of mitosis is to keep the chromosome
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