Related Experiment Video
Updated: Aug 4, 2026

Effect of Male Accessory Gland Products on Egg Laying in Gastropod Molluscs
Published on: June 22, 2014
True hermaphroditism
Abstract:
Eleven cases of true hermaphroditism (eight previously reported) studied at The Johns Hopkins Hospital are presented. The two most recently observed patients had what is to be considered an appropriate endocrine evaluation. This includes karyotyping, and measurement of 24-hour urinary 17-ketosteroids, gonadotropins, plasma testosterone, dihydrotestosterone, and all their precursors before and following a human chorionic gonadotropin stimulation test, and a sexual skin biopsy for androgen receptor binding and 5 alpha-reductase activity. The differential diagnosis of true hermaphroditism is discussed and an approach to gender assignment is presented.
Related Concept Videos
Mate Choice
Hybrid Zones
Incomplete Dominance
Background and Environment Affect Phenotype
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
The Ratio of X Chromosome to Autosomes
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Red Algae

