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okie...forget the ratio...we see that the grandparents are normal so there genotype is either TT or Tt...it should be Tt cuz when offsprings are showing 'abnormality' it means that by crossing we should get tt which is ONLY possible when the grandparents are Tt and Tt. get it?I've tried to make a rough sketch of an example of crosses between a heterozygous and a homozygous recessive.. check it out!