If the female is removed, the reproductive male will change sex and the largest of the non-reproductive males will mature and become reproductive. Where the organism is born as a female, and then changes sex to a male. They do not practice self-fertilization, but when they find a mate, the pair takes turns between which one acts as the male and which acts as the female through multiple matings, usually over the course of several nights. It has been shown that fishing pressure can change when the switch from male to female occurs, since fishermen usually prefer to catch the larger fish. Individuals are born as males or females, but if they are born males, they are not born as terminal phase males.
Females and initial phase males can become terminal phase males. Reproductive system of gastropods: These fish are simultaneous hermaphrodites. Some humans were historically termed true hermaphrodites if their gonadal tissue contained both testicular and ovarian tissue, or pseudohermaphrodites if their external appearance phenotype differed from sex expected from internal gonads. Mating with a partner is more desirable biologically, as the genetic material of the resultant offspring is varied, but if mating with a partner is not possible, self-fertilization is practiced. Usually, the most dominant female or initial phase male replaces any terminal phase male when those males die or abandon the group. Clownfish are initially male; the largest fish in a group becomes a female. Ghiselin  which states that if an individual of a certain sex could significantly increase its reproductive success after reaching a certain size, it would be to their advantage to switch to that sex. Although they possess ovaries and testes, they have a protective mechanism against self-fertilization. After mating, the external portion of the penis detaches, but is able to regrow within 24 hours. They are not territorial. Lythrypnus dalli Family Lythrypnus are a group of coral reef fish in which bidirectional sex change occurs. For instance, groupers are favoured fish for eating in many Asian countries and are often aquacultured. Sequential hermaphroditism is common in fish particularly teleost fish and some jellyfish , many gastropods such as the common slipper shell , and some flowering plants. Terminal phase males are territorial and have a distinctively bright coloration. Intersex is in some caused by unusual sex hormones; the unusual hormones may be caused by an atypical set of sex chromosomes. Upon fertilization of the two ova by two sperm cells one carrying an X and the other carrying a Y chromosome , the two fertilized ova are then fused together resulting in a person having dual genitalial, gonadal ovotestes and genetic sex. One possible pathophysiologic explanation of intersex in humans is a parthenogenetic division of a haploid ovum into two haploid ova. Initial phase males do not look like males and spawn in groups with other females. Sequential hermaphrodites can only change sex once. Wrasses also have an uncommon life history strategy, which is termed diandry literally, two males. Other kinds of intersex conditions are identified immediately at birth because those with the condition have a sexual organ larger than a clitoris and smaller than a penis. Snails typically reproduce in early spring and late autumn. Sequential hermaphrodites dichogamy occur in species in which the individual is born as one sex, but can later change into the opposite sex. Shells of Crepidula fornicata common slipper shell. Individuals are born as males or females, but if they are born males, they are not born as terminal phase males. Earthworms are another example of a simultaneous hermaphrodite.
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