Which syndrome is associated with three complete chromosome sets and is almost always lethal?

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Multiple Choice

Which syndrome is associated with three complete chromosome sets and is almost always lethal?

Explanation:
Three complete chromosome sets means triploidy, where the zygote has 69 chromosomes. That extra full genome disrupts development so severely that it is almost always lethal, typically ending in miscarriage or death shortly after birth. In contrast, trisomies involve three copies of a single chromosome within the normal two sets—some are compatible with life (like trisomy 21, Down syndrome), while others are not. Turner syndrome is a monosomy (single X chromosome, 45,X) and does not involve a complete extra genome. So the description of three complete chromosome sets best matches triploidy and its usually lethal outcome.

Three complete chromosome sets means triploidy, where the zygote has 69 chromosomes. That extra full genome disrupts development so severely that it is almost always lethal, typically ending in miscarriage or death shortly after birth. In contrast, trisomies involve three copies of a single chromosome within the normal two sets—some are compatible with life (like trisomy 21, Down syndrome), while others are not. Turner syndrome is a monosomy (single X chromosome, 45,X) and does not involve a complete extra genome. So the description of three complete chromosome sets best matches triploidy and its usually lethal outcome.

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