If an individual presents gene having
different alleles ( situation), for
example, A A’, three types of
may beformed: AA, A’A’
AA’. The question refers an individual
bearing a made of two
different , so it is the ’
genotype (the heterozygous individual).

AA’ individual may manifestthe
conditioned by the allele or
the phenotype conditioned the allele
A’ or a mixed phenotype of
two forms. If the A is dominant
over allele A’ the form
by A will manifest. A’ isthe dominant
allele, form determined by A’
manifest. This phenomenon is as
dominance and occurs the
recessive (nondominant) allele
only when present in
in the genotype (in ),
while the dominant allele
even when in heterozygosity. none of
the alleles a mixture of the
varieties conditioned by both
appears or instead a form may
come out.