If the dominant allele is t and the recessive allele ("non-taster") is n, than tn and tt are the genotypes of a "taster". tn is heterozygous and tt is dominant homozygous. nn is the genotype of a "non-taster" and it is recessive homozygous.
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Answer
The answer for first fill in the blank is “ positive”
The answer for second fill in the blank is negative
I think it is the blood vessels ???
In a process called Starch Synthesis.
