Read each question carefully and then select the best answer.

1		Baltes believes that selection primarily operates during the last half of life.
			A)	True
			B)	False
2		A one-sided view of evolution purports that biology and environment influence each other.
			A)	True
			B)	False
3		Chromosomes are contained in the nucleus of a cell.
			A)	True
			B)	False
4		Humans have approximately 30,000 to 35,000 genes.
			A)	True
			B)	False
5		Meiosis occurs to form eggs and sperm.
			A)	True
			B)	False
6		Sickle-cell anemia occurs most often in Asian Americans.
			A)	True
			B)	False
7		Canalization is the range of possible phenotypes for each genotype.
			A)	True
			B)	False
8		Down syndrome is caused by the presence of an extra chromosome.
			A)	True
			B)	False
9		Fraternal twins are also called monozygotic twins.
			A)	True
			B)	False
10		The germinal period takes place in the first two weeks after conception.
			A)	True
			B)	False
11		The placenta is a sac that contains a clear fluid in which the embryo floats.
			A)	True
			B)	False
12		Teratogens are sex-linked abnormalities.
			A)	True
			B)	False
13		A mother who is HIV positive should avoid breast-feeding her infant.
			A)	True
			B)	False
14		The age of the mother has no bearing on the health of a fetus.
			A)	True
			B)	False
15		The last stage of birth is the longest stage.
			A)	True
			B)	False
16		Analgesia is used to relieve pain during labor and delivery.
			A)	True
			B)	False
17		Preterm infants are those whose birth weight is below normal when the length of the pregnancy is considered.
			A)	True
			B)	False
18		A score of 3 on the Apgar test is average and indicates no problems with the newborn.
			A)	True
			B)	False
19		The Brazelton Neonatal Behavior Assessment Scale is administered 24 to 36 hours after birth.
			A)	True
			B)	False
20		If a mother does not hold a newborn immediately after birth, the child will never form a secure attachment to her.
			A)	True
			B)	False