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True or False
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1
Dizygotic twins are also known as identical twins.
A)True
B)False
2
An embryo with XX chromosomes is a genetic female.
A)True
B)False
3
Recessive inheritance occurs when a person receives two matching, recessive alleles.
A)True
B)False
4
Most traits result from recessive inheritance.
A)True
B)False
5
Sickle-cell anemia and Tay-Sachs disease are examples of sex-linked mutations.
A)True
B)False
6
A heritability statistic is used to say what portion of an individual's traits is due to genetics and how much to his or her environment.
A)True
B)False
7
Traits that are so strongly programmed by genes that environment has little influence on their expression are said to show high canalization.
A)True
B)False
8
The cephalocaudal principle suggests that development proceeds from the head first, then to the lower parts of the body.
A)True
B)False
9
Fetuses can learn.
A)True
B)False
10
Although the mother's age has been linked to Down syndrome, fathers' ages are not associated with any problems for their children.
A)True
B)False





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