Answer:
<h2>Their phenotype depends on the type of allele, if it dominant, recessive, co-dominant, or incomplete dominant</h2>
Explanation:
Lets take a single gene for one character,
 Two identical heterozygous individuals  for single gene or two genes
Aa and Aa   or iAiB,   iAiB,
scenario-1, if , A is completely dominant on a.
scenario 2 if, iA and iB  are co-dominant,
scenario 3,  if both are recessive,
 scenario 4 , if they are incompletely dominant.
Here cross is,
Between Aa And Aa= AA, Aa ,Aa  aa.
iAiB and iAiB=   iAiA, iAiB, iAiB, iBiB
Their phenotype depends on the type of allele, if it dominant, recessive, co-dominant, or incomplete dominant.