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.
Forum (6) Echo Time. (TE) The echo time represents the time in milliseconds between the application of the 90 pulse and the peak of the echo signal in spin echo and inversion recovery pulse sequences. See also Repetition Time, Spin Echo Sequence and Inversion Recovery Sequence.