Final answer:
Tammy's easy temperament, evident from infancy, encompasses positive emotions and adaptability, which usually leads to warm, responsive parenting interactions.
Step-by-step explanation:
According to the theories of psychologists Thomas and Chess (1977), temperament refers to inborn, genetically based personality differences that are evident very early in life. For instance, Tammy, age 17, who has an easy temperament, would be characterized by traits such as a high activity level, positive emotions, good adaptability to change, and the ability to regulate emotions effectively. Her easy temperament likely makes her more socially adaptable, easier to soothe, and thus, she would likely elicit a warm and responsive parenting style. Such a temperament profile contrasts with infants described as having a difficult temperament, who might display more negative emotions and be less adaptable to changes, thus posing more challenges to caregivers.