Final answer:
The two personality characteristics particularly relevant to stress are type A behaviour pattern and negative affectivity.
Step-by-step explanation:
The two personality characteristics particularly relevant to stress are type A behaviour pattern and negative affectivity. Type A individuals are characterized by an excessive competitive drive, chronic sense of time urgency, impatience, and hostility towards others. Negative affectivity refers to a tendency to experience negative emotions such as anxiety, depression, and anger.