44. 1102 Genetics I

44. 1102 Genetics I - Genetics Genetics before Men del...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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%
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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)
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/13/2010 for the course BIOG 1102 taught by Professor Robertturgeo during the Spring '10 term at Cornell.

Page1 / 6

44. 1102 Genetics I - Genetics Genetics before Men del...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online