Nature refers to __________, and nurture refers to _________.

The fact that two-day-old infants can vary sucking patterns in response to sounds suggests

Each sperm and egg contains __________ chromosomes, and a zygote contains ________ chromosomes.

A zygote is another name for

Chromosomes contain

Genes seem to play a role in

If Natalie and Kristin are dizygotic twins, which of the following is true?

Dizygotic twins come from

Monozygotic twins come from

When five-year-old Jamie was a baby, she had a grasping and startle reflex, but not any more. What most likely happened?

Development within a species

The fact that some children talk at 12 months and some at 18 months demonstrates

If children are never allowed to practice walking during the first 12 months of life

Which of the following is true of growth cycles?

A duck is most ready to solidly identify a mother image...

Which of the following "skills" in humans is influenced by critical periods?

How can an animals critical period possibly be extended?

If an animal does not learn a particular skill during its critical period, that skill

Feral children who miss critical periods for various skills

An extended family includes

Moms who work spend half as much time with their children as homemakers. Evidence suggests that children of employed moms tend to feel

Boys who have no father at home

Dictatorial parents tend to raise children who

If Sarah's parents are usually permissive, Sarah will

Authoritative parents tend to

Which of the following best explains why someone would abuse a child?

Separation anxiety seems to be caused by

Three-year-old Tim does not understand the principle of reversibility. Which of the following is most likely true of Tim?

separation anxiety seems to appear at the same time that the child learns to grasp

Why is it difficult to learn to speak a foreign language as an adult?

The case of Genie demonstrates that

Most people now agree that the human potential for speech

This is the highest level of cognitive development in which the child is more able to think in complex, symbolic terms.

The child begins this stage without object permanence but develops this skill near the middle of the stage.

Conservation is easily grasped at this stage, but the child still tends to see the world in black and white.

The child can not quite grasp the concept of conservation yet.

The child is obsessed with sensations and body movements.

Decisions of right and wrong are based on what others expect and approve of.

Decisions of right and wrong are based on self-centered concerns: "Will I get punished?"

Decisions of right and wrong are based on human rights and personal ethics.