How do homologous, analogous, and vestigial structures differ from each other?

Homologous structures are structures that are similar in related organisms because they were inherited from a common ancestor. ... The forelimbs of all mammals have the same basic bone structure. Analogous structures are structures that are similar in unrelated organisms.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.