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1 It is reported that amyoplasia comprises 43% of reported cases. 2  No racial tendency is present. 3  Males are more affected in X-linked recessive disorders; otherwise, females and males are equally affected.  Arthrogryposis is detected at birth or in utero using ultrasound.
Rating Newest Oldest. Best Answer: Down syndrome can be detected as early as 10 weeks of pregnancy by choriocentesis(chorionic villus sampling).it is also considered a good method of diagnosing. Other method is amniocentesis which is usually done after 12 weeks of pregnancy. Source(s): Believer Â· 7 years ago.