​Two-month-old Sheldon is snuggled in his mother’s arms. He is quietly looking around, and appears to be simply ‘absorbing’ his environment. He is attentive to sounds around him, and is very calm. Sheldon’s current state would be described as

​An embryo rests in a sac called the placenta, which is filled with amniotic fluid that cushions the embryo and maintains a constant temperature.

​ Research has conclusively found that nature has a significantly greater effect on development than does nurture across nearly all behaviors and characteristics.

The process by which the brain receives, selects, modifies, and organizes incoming nerve impulses that are the result of physical stimulation is called perception.

​When looking through a microscope at an entire set of human male chromosomes, how would you be able to differentiate an autosome pair from a sex chromosome pair?

At around 18 months of age, children will learn approximately 10 or more new words and labels each week.

​Kathleen and Alphonse are expecting their first child, and are having a pleasant conversation about the sex of the baby. Kathleen says, “Well, as long as all of the chromosomes are X, we’ll be having a girl!” How can Alphonse best respond?

​The demands that are placed on individuals by their environment are referred to as environmental press.

​Which of the following circumstances would indicate the greatest level of heritability of a trait?

​The reliability of a research measure refers to the extent to which that measure provides consistent evaluations of a given characteristic.