ch 14 I - Genetics Chin trembling in response to anxiety is...

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1/23/09 1 Genetics Chin trembling in response to anxiety is a dominant trait in humans. If both parents are heterozygous for this condition, what are the chances that their child will be a chin trembler? A. 1 in 4 B. 1 in 2 C. 3 in 4 D. 15 in 16 E. 100% Chin trembling in response to anxiety is a dominant trait in humans. If both parents are heterozygous for this condition, what are the chances that their child will be a chin trembler? A. 1 in 4 B. 1 in 2 C. 3 in 4 * D. 15 in 16 E. 100% T t T TT Tt t Tt tt 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)
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1/23/09 2 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. Darwin understood the importance of inheritance and had an uncut copy. Mendel (1822 - 1884) “Experimentation on Plant Hybridization” 1866 Darwin (1809 - 1882) “Origin of Species” 1859 But the concept of blending colored thinking. 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 F1: Vv genotype (genetic constitution) vs. phenotype (appearance) purple (F1) X purple (F1) --> 705 purple/224 white (3.15/1) Use of the Punnett square e.g. Trembling chin T = trembler, t = non-trembler
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