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Homologous structures in the external genitalia. This list of related male and female reproductive organs shows how the male and female reproductive organs and the development of the reproductive system are related, sharing a common developmental path. This makes them biological homologues. These organs differentiate into the respective sex ...
The opposite of homologous organs are analogous organs which do similar jobs in two taxa that were not present in their most recent common ancestor but rather evolved separately. For example, the wings of insects and birds evolved independently in widely separated groups , and converged functionally to support powered flight , so they are ...
The image shows homologous bones in the upper limb of various vertebrates. Comparative anatomy is the study of similarities and differences in the anatomy of different species . It is closely related to evolutionary biology and phylogeny [ 1 ] (the evolution of species).
In both sexes, the gonads go on to form the testes and ovaries; because they are derived from the same undeveloped structure, they are considered homologous organs. There are a number of other homologous structures shared between male and female reproductive systems.
All vertebrate forelimbs are homologous, meaning that they all evolved from the same structures. For example, the flipper of a turtle or of a dolphin, the arm of a human, the foreleg of a horse, and the wings of both bats and birds are ultimately homologous, despite the large differences between them. [1]
As is clear by this 2011 "Practical Urology: Essential Principles and Practice" source, from Springer Science & Business Media, page 67, "The glans penis is homologous to the clitoral glans, the corpora cavernosa are homologous to the body of the clitoris and the corpus spongiosum is homologous to the vestibular bulbs beneath the labia minora ...
Homology (biology), any characteristic of biological organisms that is derived from a common ancestor; Sequence homology, biological homology between DNA, RNA, or protein sequences; Homologous chromosomes, chromosomes in a biological cell that pair up (synapse) during meiosis
Human organs and organ systems develop in a process known as organogenesis. This begins in the third week of embryonic development, when the gastrula forms three distinct germ layers, the ectoderm, mesoderm and endoderm. The ectoderm will eventually develop into the outer layer of skin and nervous system.
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