The science of human development examines how, but not why, people change over time.

A research question becomes a hypothesis when it is stated as a prediction that can be tested.

Nature is more important than nurture in how a trait or behavior is expressed.

A developmental theory is a systematic statement of general principles that provides a framework for understanding how and why people change as they grow older.

The foundation of psychoanalytic theory is inner drives, motives, and unconscious needs.

According to John Watson, psychologists should study observable behavior.

According to Freud, the first stage of psychosexual development during infancy is the anal stage.

Piaget's first stage of cognitive development is the preoperational stage.

Carl Rogers thought that unconditional positive regard should be reserved for those who accomplish the most in a given society.

Developmentalists who subscribe to the eclectic perspective select what they consider to be the best aspects of each theory to explain development.

Genes are located on chromosomes.

Due to genetic inheritance, each child is the product of both parents, but only looks, sounds, and acts like one of them.

If the 23rd pair of chromosomes contains two X chromosomes, then that individual is a male.

The general term for the techniques designed to help infertile couples conceive and then sustain a pregnancy is in vitro fertilization (IVF).

When a person inherits a recessive gene that is not expressed in the phenotype, that person is a carrier of the gene.

Genes, culture, and age all affect vision.

Consultation and testing by trained experts that enable individuals to learn about their genetic heritage, including harmful conditions they might pass along to any children they may conceive, is referred to as couples counseling.

Every person starts life as a single cell called an embryo.

The fetus gains about 2 pounds in the third trimester.

The Apgar scale measures color, heart rate, cry, muscle tone, and breathing.