Which of the following statements accurately reflects a key finding from the 1994 “Sex
in America” survey?
A.Most Americans have sex twice a week or more.
B.Married and cohabiting couples have sex more often than noncohabiting couples.
C.Most men and women have always remained faithful to their partners and have
avoided any adulterous relationship.
D.Women think about sex far more than men do.
Answer:
Emma and Anna are identical twins who were adopted by different families a few
weeks after birth. Although genetically identical, they grew up with different physical
and psychological characteristics. For example, though both inherited a tendency to
grow large, Anna was slim and athletic due to the active lifestyle practiced in her
adoptive family. This variability can be explained by how:
A.each zygote is unique.
B.longevity genes can make an individual less vulnerable to certain diseases.
C.for each genotype, a range of phenotypes can be expressed.
D.mutated genes can be a source of genetic variability.
Answer: