What error in meiosis causes turner syndrome?
Turner Syndrome is the lack of part or a whole X sex chromosome, so this would be a syndrome that could only inhibit women. The normal separation of chromosomes in meiosis I or sister chromatids in meiosis II is termed disjunction. When the separation is not normal, it is called nondisjunction. This results in the production of gametes which have either too many of too few of a particular chromosome, and is a common mechanism for trisomy or monosomy. Turner Syndrome is in fact a syndrome that encompasses the condition monosomy X. Being that there is a irregular separation of chromosomes, you must infer that the error is somewhere in Anaphase I or II, because this is where the chromosomes separate.