Mendel‚ Genes‚ and Inheritance Chapter 12 Why It Matters Red blood cells in sickle-cell disease One amino acid in the wrong position causes the disease 12.1 The Beginnings of Genetics: Mendel’s Garden Peas Mendel chose true-breeding garden peas for his experiments Mendel first worked with single-character crosses Mendel’s single-character crosses led him to propose the principle of segregation Mendel could predict both classes and proportions of offspring from his hypotheses
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Write your name here Candidate Number Edexcel GCE Biology Advanced Subsidiary Unit 1: Lifestyle‚ Transport‚ Genes and Health Monday 14 May 2012 – Morning Time: 1 hour 30 minutes You must have: Ruler Paper Reference 6BI01/01 Total Marks Instructions Use black ink or ball-point pen. Fill in the boxes at the top of this page with your name‚ centre number and candidate number. Answer all questions. Answer the questions in the spaces provided – there may be more space
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INTEGUMENTARY SYSTEM The integumentary system consists of the skin and accessory structures‚ such as hair‚ nails‚ sudorifenous gland (sweat gland) and sebaceous gland (oil gland). Integument means covering‚ and the integumentary system is familiar to most people because it covers the outside of the body and is easily observed. FUNCTIONS OF THE INTEGUMENTARY SYSTEM 1. Protection The skin provides protection against abrasion and ultraviolet light. It prevents the entry of microorganisms
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BIOLOGY TIME: 2 HOURS (1) Food spoilage is mainly due to a) Poor quality b) high protein content c) the activities of decomposers d) excess water (2) Which of the following organisms is transmitted by houseflies? a) Plasmodium b) Vibro cholera c) Trypanosoma d) Gonococcus sp (3) The odontoid process is associated
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Use RESTRICTED to schools where students have purchased this manual Molecular Genetics IB SL IB HL IB Options AP Biology Complete nos: Complete nos: Complete nos: Complete nos: 1‚ 3-4‚ 7‚ 9(a)‚ 11‚ 13(a)-(d)‚14-15‚ 20-22 Extension: 2‚ 12 1-26‚ 28-29‚ 3132‚ 34 Extension: 27‚ 30‚ 33 Option D: 30 1-34 Some numbers as extension as appropriate L earning Objectives 1. Compile your own glossary from the KEY WORDS displayed in bold type in the learning objectives
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Which of the following is most likely to occur when a tumor-suppressor gene is mutated? - The tumor-suppressor gene and resulting protein may lose its function and ability to suppress cell proliferation. Mutations can produce a polypeptide with increased function. - TRUE ________can convert proto-oncogenes into oncogenes. - Nonsense mutations Most human embryos that are aneuploidy - are spontaneously aborted in the first trimester. Horses and donkeys are closely related species that can
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Chapter 5: Integumentary System When comparing the dermis with the hypodermis‚ A. the dermis has more fat cells than the hypodermis. B. the dermis has more vascular tissue than the hypodermis. C. the dermis contains dense connective tissue; the hypodermis contains loose connective tissue. D. the dermis contains melanocytes; the hypodermis does not. Answer C Keratinocytes: A. produce skin pigments in cell organelles called melanosomes. B. are found in both the dermal and epidermal layers
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Skeletal System Skeletal system is the biological system providing support in living organisms. Skin‚ muscle and bones allow movement. Skin - pliable covering. Muscles do actual moving. Bones give anchor to move against. The skeleton functions not only as the support for the body but also in haematopoiesis‚ the manufacture of blood cells that takes place in bone marrow. This is why people who have cancer of the bone marrow almost always die. It is also necessary for protection of vital organs
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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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CHAPTER 6 Integumentary System • Dermatology – scientific study and medical treatment of the integumentary system. • Integumentary System – consists of the skin and its accessory organs – hair‚ nails‚ and cutaneous glands • skin is the most vulnerable organ • skin is the most vulnerable organ – exposed to radiation‚ trauma‚ infection‚ and injurious chemicals • body’s largest and heaviest organ Skin and Subcutaneous Tissue • consists of two layers: – epidermis – stratified squamous epithelium
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