The principle of homology: The biological relationships (shown by colours) of the bones in the forelimbs of vertebrates were used by Charles Darwin as an argument in favor of evolution.
The sex organs of a green algae Chara are the male antheridia (red) and female archegonia (brown).
Pierre Belon systematically compared the skeletons of birds and humans in his Book of Birds (1555).
The female genitalia of Lepidoptera
Sycamore maple fruits have wings analogous but not homologous to an insect's wings.
pax6 alterations result in similar changes to eye morphology and function across a wide range of taxa.
Hox genes in arthropod segmentation
The ABC model of flower development. Class A genes affect sepals and petals, class B genes affect petals and stamens, class C genes affect stamens and carpels. In two specific whorls of the floral meristem, each class of organ identity genes is switched on.
The Cretaceous snake Pachyrhachis problematicus had hind legs (circled).
A multiple sequence alignment of mammalian histone H1 proteins. Alignment positions conserved across all five species analysed are highlighted in grey. Positions with conservative, semi-conservative, and non-conservative amino acid replacements are indicated.
Dominance hierarchy behaviour, as in these weeper capuchin monkeys, may be homologous across the primates.
One pinnate leaf of European ash
Detail of palm leaf
Leaf petioles adapted as spines in Fouquieria splendens
The very large leaves of the banana, Musa acuminata
Succulent water storage leaf of Aloe
Insect-trapping leaf of Venus flytrap
Insect-trapping leaf of pitcher plant
Food storage leaves in an onion bulb
The Cretaceous snake Pachyrhachis problematicus had hind legs (circled).

Male and female reproductive organs are homologous if they develop from the same embryonic tissue, as do the ovaries and testicles of mammals including humans.

- Homology (biology)

Each sex organ in one sex has a homologous counterpart.

- Sex organ
The principle of homology: The biological relationships (shown by colours) of the bones in the forelimbs of vertebrates were used by Charles Darwin as an argument in favor of evolution.

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