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For example, animals that need to position face-to-face to align their genital openings for reciprocal sperm donation generally do not manage to exchange sperm (Asami, Cowie & Ohbayashi, 1998; but see Schilthuizen , 2007).

However, when the mating position involves unilateral sperm donation by one individual that mounts the shell of the partner, interchiral mating is possible, although it requires an altered mating position by the sperm donor. To position itself on the partner's shell for insemination, the sperm donor crawls in a circular fashion around the shell of the mating partner (reviewed by Koene, 2010).

If the baby is male, he begins to produce testosterone, and if the hormone reaches the tissues correctly, the external genitals become a scrotum and penis.

Chromosomal or sex hormone abnormalities can produce an infant in an intersexual state.

To understand such transitions, it is important to characterize diverse modes of sex determination utilized by metazoans.

These results demonstrate conservation of the role of DM domain genes in sexual development in lophotrochozoans and suggest one means by which modulation of sex-specific pathways can drive the transition from hermaphroditism to dioecy..Hermaphrodites are normally diploid, with five pairs of autosomes and two X chromosomes.Males have the same five pairs of autosomes but only a single X chromosome.Nearly all gametes—sperm and eggs—produced by hermaphrodites are haplo-X and thus give rise to XX hermaphrodite self progeny, but rare males are generated through spontaneous X chromosome loss.Males produce equal numbers of haplo-X and nullo-X sperm, so that half of the cross progeny they sire will also be male.

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