Back Cross Method of Breeding

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Back Cross Method of Breeding

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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