The answer is one (1) phenotype. This is because epistasis interaction of gene alleles involves the masking of one phenotype of an allele of a gene (at one or more loci) by
the other. Alternatively, the epistatic alleles
may interact to cause a modification of a
phenotype.
They can be used to produce vaccines.
They can be used to determine the response of tissue to drugs.
They can be used to produce hormones.
The answer is principal procedure, this is a procedure in
which they perform treatment in a more definitive way than other ways such as
having to do diagnostic procedure or other purposes that can contribute to the
treatment or the procedure being done.
