It affects the 21st chromosomes the vitamin required to produce dna is vitamin B12

1 3 1

This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Down Syndrome is caused due to the presence of an additional copy of the chromosome numbered 21. Hence, the affected individual shows this extra copy of chromosome.
Vitamin B12 (Folic Acid) is essential for the production of DNA in human body cells.
1 5 1