Prader-Willi syndrome is caused by a missing gene on chromosome 15. Normally, parents each pass down a copy of this chromosome. The defect can occur in a couple of ways: The father's genes are missing on chromosome 15.
: easy for the mind to understand or recognize. 1  It was obvious that things weren't working out. 2  Her reasons for leaving were obvious. = It's obvious why she left. 3  The answer seems obvious enough to me.  The problem was immediately obvious to everyone in the 1  room. He was the obvious candidate/choice for president.
Sample Sentences & Example Usage. 1  Isaac Asimov: It pays to be obvious, especially if you have a reputation for subtlety. 2  Billy Madison: Principal Any attempt to cheat, especially with my wife, who is a dirty, dirty, tramp, and I am just gonna snap.