Chapter 15 The chromosomal basis of inheritance Key ideas: 1) Mendelian Inheritance has its physical basis in the behavior of chromosomes during sexual life-cycle. 2) Morgan traced a gene to a specific chromosome. 3) Linked genes tend to be inherited together because they are located on the same gene. 4) Independent assortment of chromosomes and crossing over produce genetic recombinants. 5) Geneticists use recombination data to map a chromosome’s genetic locus. 1900 Biology finally
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Have you ever wondered why people resemble their parents? The answer to this and other questions about inheritance lies in a specialized branch of biology called genetics. Geneticist found that most aspects of life have a hereditary basis and that many traits can appear in more than one form. For instance‚ human beings have blond‚ or red‚ or brown‚ or black hair. They may have one of several different types of blood‚ one or several colors of skin. Their ear lobes may be attached or free. They may
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Distribution of plants and animals that had a common ancestor to different areas. 2. When in different areas‚ develop different characteristics‚ like snakes in gene flow. C. Anatomy 1. Vestigial structures – Structures which are fully developed in one organism‚ but not used and nonfunctional in another. Ostrich wings‚ human tailbones. 2. Homologous structures – Same bones in different organisms. Embryos are very much alike. D. Biochemical 1. All organisms have similar cell components such as membrane
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2002 AL Biology marking scheme Paper 1 Section A Terms with *‚ mark deduction for wrong spelling. Alternatives and correct answers not listed in this document should be accepted.) Marks 1 .1/2 mark for each correct answer Column 1 E earthworm B jellyfish F starfish D clam 2. (2) Concepts for mark allocation • worn-out organelles are enclosed by membrane forming vacuoles (1) worn-out organelles are enclosed by lysosomes (3) • lysosome releases hydrolytic enzymes into the
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by heredity from a structure in most recent common ancestor of species. - Analogous Structures: anatomical structures that have closely related functions but do not derive from the same ancestral structures. (ex. Wings of birds vs. wings of butterflies or insects) - Vestigial Structures: Anatomical structures that seem to fit no function but that resemble structures with functional roles in related organisms. (eyes of moles‚ human coccyx‚ human appendix) - Phylogeny: the relationship
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CHAPTER 22: DESCENT WITH MODIFICATION Questions in This Course How did life on earth become the way it is today? What differences exist among living organisms? What drives biodiversity? How are structures related to function? Life: The Why and the How Ultimate vs. Proximate questions: Ultimate: Why? Why are we here? Why does life exist? Proximate: How? How did we get here? How did life become what it is today? Philosophy and religion—Ultimate questions Science—Proximate questions
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FACP 2 APPROACHES AND PRACTICES IN PEST MANAGEMENT SUBMITTED BY: MESHELEMIAH A. SALLEVA SUBMITTED TO: MR. STEVE DOMONDON WABAN PEST IN THE RICE Common name: Scientific name: 1. Rice Hispa Dicladispa armigera 2. Rice Leaf Folder Cnaphalocrocis medinalis 3. Striped Stem Borer Chilo supressalis 4. White Stem Borer Scirpophaga innotata 5. Yellow Stem Borer Scirpophaga incertulas 6. White-Backed Planthopper Sogatella furcifera 7. Brown Plant Hopper Nilaparvata lugens 8. Ant Selonopsis geminate
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ISC Board Important Questions Biology [Set-1] Q1. a) (i). Absorption spectrum and Action spectrum Answer: A curve obtained by plotting the amount of absorption of different wavelengths of light by a particular pigment is called absorption spectrum of that pigment. An action spectrum is a curve showing the effectiveness of different wavelengths of light in stimulating the process being investigated. (ii). Heart Wood and Sap Wood Answer: In most trees the outer light colored region of the wood
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you probably also have gained insights into similarities and differences between species. On the second page of this test‚ arrange the following species into your own phylogenetic tree diagram you believe based on their shared characteristics. (a) Drosophila melanogaster (fruit fly) (b) Ectoedemia castaneae (moth) (c) Hyla cinerea (tree frog) (d) Rattus rattus (rat) (e) Danio rerio (zebrafish) (f) Homo sapiens (human) (g) Saccharomyces cerevisiae (yeast) (h) Lumbricus terrestris (earthworm) (i) Sus
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sexual selection stabilizing selection strata vestigial structures Good review questions from the “Testing Your Knowledge” section at the end: #’s 13‚ 14 Exam questions are similar‚ but not exactly like these: One of the major sources of evidence for evolution is in the comparative anatomy of organisms. Features that look different but have similar structural origin are called A. Homologous structures. B. Analogous structures. C. Vestigial structures. D. Equivalent structures. Darwin
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