The Kallmann syndrome is passed down on the X chromosome and is recessive, which means that if there’s a healthy copy of an X chromosome too, it isn’t a problem. As men only have one X chromosome, the number of men who suffer from Kallmann syndrome is about 4 times as high (1 in 30,000) than the number of women (1 in 120,000).
It is called sex linked traits. The traits whose genes are located on the sex chromosomes only (other chromosomes are called autosomes) which are homozygous dominant. The reverse would have been the case if the disease is sex linked but heterozygous. Baldness and haemophilia are also sex linked
The more visible effects are a puberty that’s either delayed or doesn’t happen because certain sex hormones aren’t produced. That comes with the usual issues (for men: micropenis, undescended testicles, possibly no facial hair, the voice doesn’t get deeper; for women: no periods) and must be treated with replacement hormones. If that doesn’t happen, those who suffer from it will be infertile.
It is called Klinefelter syndrome and it is as a result of non-disjunction during meiosis.
I know what a sex linked trait is. And no, Kallmann syndrome and Klinefelter is NOT the same.