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Sexual Selection and Animal Genitalia. Wake 15 September In general zoology, given the great variety in organs, physiologies, and behaviors involved in copulation , male genitalia are more strictly defined as "all male structures that are inserted in the female or that hold her near her gonopore during sperm transfer"; female genitalia are defined as "those parts of the female reproductive tract that make direct contact with male genitalia or male products sperm, spermatophores during or immediately after copulation". The initial appearance of the fetal genitalia looks basically feminine: Young woman making gesture with hands covered with transparent blue fabric textile. Mosses , ferns , and some similar plants have gametangia for reproductive organs, which are part of the gametophyte. You are viewing our newest and freshest images for your search.
If the fetus has testes, and if the testes produce testosterone, and if the cells of the genitals respond to the testosterone, the outer urogenital folds swell and fuse in the midline to produce the scrotum; the protuberance grows larger and straighter to form the penis; the inner urogenital swellings grow, wrap around the penis, and fuse in the midline to form the penile urethra. Hyman's Comparative Vertebrate Anatomy. Mosses , ferns , and some similar plants have gametangia for reproductive organs, which are part of the gametophyte. Back to search Esc. They also produce most of the primary hormones that affect sexual development, and regulate other sexual organs and sexually differentiated behaviors.