Y chromosome

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Related to holandric: holandric gene, holandric inheritance

Y chromosome

[′wī ′krō·mə‚sōm]
(genetics)
The sex chromosome found only in the heterogametic male sex, as in mammals and Drosophila.
References in periodicals archive ?
Considering this species' holandric condition, the presence of spermathecae in both testicular segments (10 and 11), and also the numerous spermathecae posterior to testes in segments 12, 13, 14, 15, and the regular arrangement of setae, no similarity to the species accredited to lesothoensis species-group has been found.
The location of spermathecae in the testicular segments, with one pair of pores anterior to the testes, is unique in holandric species, and to date it has been observed only in this species, and in two species of Geogenia and one of Tritogenia, which are also discussed in this paper.
This species obviously differs from the proandric species accredited to the lesothoensis species-group in being holandric, with setae arranged in four regular rows and no discrepancy in the arrangement.
The presence of spermathecal pores in both testicular segments in holandric species is unusual for microchaetids, and was noted only in benhami and mkuzi.