In humans, this sex chromosome is present only in males
The Y chromosome is present in males, who have one X and one Y ... 
Because only males have the Y chromosome, the genes on this... [DOC] [TLE] Human Chromosomal Abnormalities: Sex Chromosome Abnormalities [PAR] Male abnormalities are the result of irregular numbers of either the X or the Y ... 
occurs when females inherit only one X chromosome--their genotype is X0 (i.e.,...