Iis down syndom caused by a dominant or recessive allele?

Answer 1

Down syndrome is not catagorised as co-dominant or incomplete dominance, its trisomy 21; this means that you have a third or part of a third Chr21, causing the condition.

Answer 2

Down syndrome is caused by the presence of an extra copy of chromosome 21, known as trisomy 21. It is not caused by a single gene with a dominant or recessive inheritance pattern. It is a chromosomal disorder that can occur randomly during cell division.

Answer 3

Neither. Down's Syndrome is cause by there being an extra chromosome included in the egg that gave rise to the individual.

Answer 4

It's neither