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Genetics
Exam 1
Question | Answer |
---|---|
genetics | scientific study of heredity and hereditary variation |
hereditary | the transmission of traits from one generation to the next is called inheritance or heredity |
when did the study of genetics begin? | a long held fascination |
Hippocrates | 500 B.C.E, Theory of Pangenesis (seeds are produced by all parts of the body in fluids called "humors"), collected in repro. organs |
Aristotle | 384 B.C.E, proposed that blood produced and carried traits. male blood needed to form semen, semen-contained generative vital thermal (organisms start without out without form and are molded into their final form using a generative force) |
preformation | in the 17th and 18th centuries scientists using the newly developed microscopes imagined that they could see miniature replicas of human beings inside sperm heads. |
Jean-Baptiste Lamarck | invoked the idea of “the inheritance of acquired characters,” not as an explanation for heredity but as a model for evolution |
Alfred Russel Wallace | originally postulated the theory of evolution by natural selection |
Walter Sutton and Theodore Boveri | propose that chromosomes bear hereditary factors in accordance with Mendelian laws |
Hershey and Chase | experiment using radioactive Sulfer and Phosphorus with bacteriophages |
P generation | parental generation, the first two individuals that mate in a genetic cross |
F1 generation | the first generation of offspring obtained from an experimental cross of two organisms |
F2 generation | the second generation of offspring, obtained from an experimental cross of two organisms; the offspring of the F1 generation |
meiosis | (genetics) cell division that produces reproductive cells in sexually reproducing organisms |
Principle of Dominance | when individuals with contrasting traits are crossed, the offspring will express only the dominant trait |
Law of Independent Assortment | states that genes for different traits can segregate independently during the formation of gametes |
unraveled and long DNA (during interphase) |