Is turner's syndrome dominant or recessive?

Neither: Turner syndrome is not usually consider dominant or recessive. In Turner syndrome the affected individual is missing on sex chromosome. They only have one which is one X chromosome. The missing chromosome is usually lost during cell division when the cells are multiplying, it can be an X or a Y missing. So, Turner syndrome is not usually inherited but an event that happened in the new baby.

Neither: It is due to lack of one in the pair of X chromosomes.

Neither: Turner syndrome is not caused by a variation of a gene, or a mutation of a gene. Therefore, Turner syndrome is neither dominant or recessive, but instead is a type of aneuploidy. Aneuploidy means there is an abnormal number of chromosomes. Turner syndrome's type of aneuploidy is "monosomy X", which means having only one X chromosome, and no Y nor a second X chromosome.