Genes aren't the only factor. Because you inherit one APOE gene from your mother and another from your father, you have two copies of the APOE gene. Having at least one APOE e4 gene increases your risk of developing Alzheimer's disease. If you have two APOE e4 genes, your risk is even higher.
Simple Time Signatures. In simple time signatures, the beat falls on undotted notes such as quarter notes, half notes, eighth notes etc. Also, every beat is divisible by two. In 4/4 (also referred to as quadruple metre) the basic beat is a quarter note. This beat can be split into groups of two. By that I mean, a quarter note divides into eighth notes and eighth notes divide into sixteenth notes. Another example of a simple time signature is 3/4 also referred to as triple metre.
1 9/8 time is classified as compound triple. 2  There are three beats (three dotted quarter notes), thus making the meter triple. 3  Since each beat is made up of three notes, the meter is compound. 4  Any time signature with a 9 on top is compound triple. 5  Although 9/8 is the most common; 9/2, 9/4, and 9/16 can also be used.