SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Too many chromosomes at Chromosome 21 (Down Syndrome)
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Too many chromosomes at Chromosome X (Triple X-Syndrome)
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A single chromosome at Chromosome 21
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Non-disjunction of Chromosome 56
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Detailed explanation-1: -Also known as Down syndrome, trisomy 21 is a genetic condition caused by an extra chromosome. Most babies inherit 23 chromosomes from each parent, for a total of 46 chromosomes. Babies with Down syndrome however, end up with three chromosomes at position 21, instead of the usual pair.
Detailed explanation-2: -It is also called trisomy 21. It includes certain birth defects, learning problems, and facial features. A child with Down syndrome also may have heart defects and problems with vision and hearing. How severe or mild these problems are varies from child to child.
Detailed explanation-3: -| What the result means A “high risk” result for trisomy 21, trisomy 18 or trisomy 13 means there is a high chance for the baby to have one of these chromosome differences. A “high risk” result does not mean that the baby has a chromosome difference for sure.