Homologous
gene
Molecular investigations by
developmental biologists have
revealed striking similarities
between the structure of genes
(The hereditary determinant of
a specified characteristic of
an
individual; specific sequences
of nucleotides in DNA.)
regulating ontogenetic
phenomena in diverse
organisms.
Homologous
structure
Characters in different
species
which were inherited from a
which were inherited from a
common ancestor and thus
share a similar ontogenetic
pattern.
Homology is...
Homologous
chromosome
One part of two genetically
different chromosomes.
Each homologous chromo-
different chromosomes.
Each homologous chromo-
some is inherited from a
different parent, and contains
information about the same
gene sequence.
The relationship of any two characters that have descended from a
common ancestor. This term can apply to a
morphological structure, a chromosome or an individual
gene or DNA segment.
6