Back Cross Method of Breeding

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Information about Back Cross Method of Breeding
Education

Published on November 26, 2008

Author: chhabra61

Source: authorstream.com

Slide 1: Monogenic / Oligogenic Transfer HYBRIDIZATION Slide 2: Susceptible BUT high yielding resistant 50% 50% 75% 25 87.5% 93.75% 96.87% x x x x x F1 BC1 BC2 BC3 BC4 99.999 % GENERAL Back-Cross Scheme to Transfer Resistance Genes Susceptible variety converted to Resistant Variety BC1F2 BC2F2 BC3F2 BC4F2 BCnF2 Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year n Slide 3: Dominant gene to transfer This is a breeding scheme to transfer a resistance gene (governed by dominant gene) in a susceptible variety (having recessive gene) which is otherwise high yielding i.e. this back cross scheme is to remove the defect of an existing highly adapted variety Year 1 Year 2 Year 3 Year 4 Year 5 Year 9 Year 10 Year 11 Slide 4: Dominant gene to transfer One extra year Another extra year Another extra year Almost double time taken

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