Question : Three copies of chromosome -21 in a child with Down's syndrome have been analysed using molecular biology technology to detect any possible DNA polymorphism with reference to different alleles located on chromosome -21.Results showed that out of 3 copies 2 of the chromosome of the child contain the same alleles as one of the mohter's alleles .Based on this when did the non-disjunction event mostly likely occur:

Question : Three copies of chromosome -21 in a child with Down's syndr

1.	Question : Three copies of chromosome -21 in a child with Down's syndrome have been analysed using molecular biology technology to detect any possible DNA polymorphism with reference to different alleles located on chromosome -21.Results showed that out of 3 copies 2 of the chromosome of the child contain the same alleles as one of the mohter's alleles .Based on this when did the non-disjunction event mostly likely occur:
Answer» PATERNAL meiosis-I MATERNAL meiosis-I Paternal meiosis-II Matrenal meiosis-II Answer :B