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Originally Posted by MohsinShah
I am fine with the test cross i.e that "T" and "t" thing
but my problem is that how does ''heterozygous'' mean that each of them[parents] have one allele for the disease ?
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the question statement reads like this '' heterozygous normal''
the word normal indicates that clinically the patient is not having the disease but on the other hand its genotype is not completely ''normal'' so it becomes Tt
its opposite situation will be '' homozygous normal'' meaning that the patient like in the above condition is clinically disease free and in addition both the alleles are normal or ''T'' so the genotype will be TT
so it follows that
heterozygous normal '' Tt "" no diseaes clinically,,although one disease allele is present "" t "'
homozygous normal '' TT '' no disease clinically,, and both alleles are ''normal''
words normal and diseased have been used in place of dominant and recessive for easy understanding