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The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), the schistosome family of flatworms, and some reptiles, e.g. majority of snakes, lacertid lizards and monitors, including Komodo dragons.
Often in snake species, females will copulate with multiple males in one mating aggregation. [6] [37] To increase his chances in paternity, a male will sometimes try to inhibit the female from re-mating. A common tactic in many species is to obstruct the reproductive pathway of the female in order to physically prevent additional copulations.
In fish, reproductive histories often include the sex-change from female to male where there is a strong connection between growth, the sex of an individual, and the mating system within which it operates. [55] In protogynous mating systems where males dominate mating with many females, size plays a significant role in male reproductive success ...
One can attempt to identify the sex of a snake when the species is not distinctly sexually dimorphic by counting scales. The cloaca is probed and measured against the subcaudal scales. [67] Counting scales determines whether a snake is a male or female, as the hemipenes of a male being probed is usually longer. [67] [clarification needed]
In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively. Hormone levels in the male parent affect the sex ratio of sperm in humans. [25]
The hemipenis is the intromittent organ of Squamata, [4] which is the second largest order of vertebrates with over 9,000 species distributed around the world. They differ from the intromittent organs of most other amniotes such as mammals, archosaurs and turtles that have a single genital tubercle, as squamates have the paired genitalia remaining separate. [5]
2025 is the Year of the Snake, a reptile which according to Chinese culture represents wisdom, intuition and transformation. As we enter this year of great change, expect to see your pet going ...
As sex-determining mechanisms, TSD and genetic sex determination (GSD) should be considered in an equivalent manner, [8] which can lead to reconsidering the status of fish species that are claimed to have TSD when submitted to extreme temperatures instead of the temperature experienced during development in the wild, since changes in sex ratio ...
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