A test cross uses a homozygous recessive to determine an unknown genotype, while a back cross is with a parent to recover a specific trait. You use a test cross for analysis, a back cross for breeding. I know this because I've filled my son's old NCERT books with notes on these lines while he now studies engineering, and I still solve these MCQs at the shop counter to feel close to his world. But honestly, in my life, every cross feels like a 'back cross'—trying to breed his success from my own limited resources.
#grassroots#parents
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