44. 1102 Genetics I - 1/29/10! Genetics! Genetics before...

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1/29/10 1 Genetics Assyrian relief carving from 870 B.C. Artificial pollination of date palms by priests in bird masks 100 B.C terracotta vase from Mexico may depict a Mexican hairless dog 700 B.C Assyrian relief Mastiff-type dogs Genetics before Mendel Medieval hunt note the greyhound Genetics before Mendel Gregor Johann Mendel (1822 - 1884) He recognized the importance of a tractable system • all-or-nothing traits • true-breeding varieties • large numbers of plants (29,000 altogether) He was trained in mathematics and botany Although his paper was discussed, its importance was not realized. The concept of blending colored thinking at the time. Darwin had an uncut copy of Mendel’s paper. Mendel (1822 - 1884) “Experimentation on Plant Hybridization” 1866 Darwin (1809 - 1882) “Origin of Species” 1859 The ACHOO syndrome (sneezing in response to bright light) is a dominant trait in humans. If one parent is heterozygous for this condition and the other does not sneeze in response to bright light, what are the chances that their child will be a sneezer? A. 1 in 4 B. 1 in 2 C. 3 in 4 D. 15 in 16 E. 100%
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1/29/10 2 The ACHOO syndrome (sneezing in response to bright light) is a dominant trait in humans. If one parent is heterozygous for this condition and the other does not sneeze in response to bright light, what are the chances that their child will be a sneezer? A. 1 in 4 B. 1 in 2 * C. 3 in 4 D. 15 in 16 E. 100% Mendel discovered the “particulate” nature of heredity purple* X white flowered plants (P generation) --> all purple (F1 Generation) round seeded X wrinkled-seeded --> all round Did the other characters disappear? *sometimes called violet White reappears Purple is “dominant” (V) White is “recessive” (v) true-breeding purple: VV true-breeding white: vv F1: Vv genotype (genetic constitution) vs. phenotype (appearance)
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44. 1102 Genetics I - 1/29/10! Genetics! Genetics before...

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