Question

how many copies of this str did this man inherit from his mother?
options: 4, 6, 10, 92, 138

Explanation:

Step1: Identify maternal chromosome

The image labels the upper chromosome as maternal.

Step2: Count STR copies on maternal chromosome

The maternal chromosome's STR region has 6 copies (marked 1-6).

Step3: Match with options

6 is one of the options.

Answer:

6