A child born with a single transverse palmar crease, a short neck with excessive skin at the nape, a depressed nasal bridge, and cardiac defects is most likely to have which autosomal abnormality?1. Trisomy 21
2. Trisomy 18
3. Trisomy 14
4. Trisomy 13

The correct answer is 1. Trisomy 21

Explanation:

Trisomy 21 is a genetic disorder that is also known as Downs syndrome in which an extra chromosome is inherited by the baby from the parent.

In this syndrome instead of the usual pair, three chromosome is present at position 21. Children with this syndrome developmental and mental problems like distinctive facial features, Heart, kidney and thyroid issues, Heart, kidney and thyroid issues, short neck with extra skin in the back of the neck, a depressed nasal bridge.

Early the life expectancy of people with down syndrome was 25 years but now it has increased to 60 years.

b and c would be the answers