Genetics1 - Mendelian Patterns of Inheritance Organisms...

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Unformatted text preview: Mendelian Patterns of Inheritance Organisms attain diversity of form, function and behavior through heredity modifications of preexisting lines of ancestors Genetics = Study of Genes and How They Work Gene - Unit of Inheritance; basis of every characteristic; instructions for a trait sequence of nucleotides in dna genetic differences enzymes differences differences in appearance and physiology Early Ideas Theophrastus (371 - 287 BC)- Recognized differences between males and females Hippocrates (460 - 377? BC)- Mechanism of heredity; particles or seeds are produced in all parts of body and passed on to offspring Aristotle (200s BC)- Male and female semen produced flesh and blood offspring Spontaneous Generation (17th century) Blending Concept of Inheritance If parents were different, offspring would possess traits intermediate between those of parents. Parents of contrasting appearance produce offspring of intermediate appearance X Parents Offspring Gregor Mendel (1822-1884) Austrian monk Studied botany and mathematics at University of Vienna Taught natural science at local high school Studied inheritance in common edible garden pea , Pisum sativum Carefully gathered and documented mathematical data from his experiments Formulated fundamental laws of heredity in early 1860s-no knowledge of cells or chromosomes; no microscope The Garden Pea The Right Organism true breeding Self pollinates Can be mated by hand Easy to cultivate; grows rapidly The Right Experiments 1 trait/time Simple, discrete traits Counted offspring The Right Analysis Traits Studied by Mendel...
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Genetics1 - Mendelian Patterns of Inheritance Organisms...

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