Question

  'Backcross breeding', a method commonly used to transfer one or a few specific desirable genes such as disease resistance from a donor parent into an otherwise well-adapted, high-yielding variety, involves repeatedly crossing the hybrid progeny back to which parent over successive generations?

A The donor parent carrying the desirable gene
B A completely unrelated third parent variety
C The recurrent parent
D Both parents alternately in each successive generation
E The F2 generation exclusively, without further crossing
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