"A mode of inheritance that is observed for recessive traits related to a gene encoded on the X chromosome. In the context of medical genetics, X-linked recessive disorders manifest in males (who have one copy of the X chromosome and are thus hemizygotes), but generally not in female heterozygotes who have one mutant and one normal allele." [HPO:curators]
"Absence of any measurable level of sperm in his semen, resulting from a defect in the production of spermatozoa in the testes. Can be differentiated from obstructive azoospermia on the basis of testicular biopsy." [HPO:probinson, pmid:20514278]
"Absence of any measurable level of sperm in his semen, resulting from post-testicular obstruction or retrograde ejaculation. Can be differentiated from obstructive azoospermia on the basis of testicular biopsy." [HPO:probinson, pmid:20514278]
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