Which of the following codes describes position 12 on the long arm of chromosome 13?
13p12
13q12
12p13
12q13

13q12

Explanation:

In cytogenetics, the notation used follows a series of rules.  

When you read that something happened, for example a translocation, in the position 13q12, this means that it is in the chromosome 13, in the long arm (q), band 1 and sub band 2.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.