KCET 2015 Biology Solved Paper

Question : 51 of 60

Marks: +1, -0

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 chromosomes of the child contain the same alleles as one of the mother’s alleles. Based on this when did the non-disjunction event most likely occur?

Maternal meiosis I
Maternal meiosis II
Paternal meiosis I
Paternal meiosis II

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