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Human Biology, 7/e
Dr. Sylvia S. Mader
Genes and Medical Genetics
True/False
Please answer all questions
1
The physical appearance of the individual is called the phenotype. (p. 404)
A)
True
B)
False
2
A recessive allele must be received by both parents to bring about a recessive phenotype. (p. 404)
A)
True
B)
False
3
Each child has a 50% chance of having a recessive phenotype if one parent is heterozygous and the other is pure recessive. (p. 406)
A)
True
B)
False
4
Tay-Sachs disease is of high incidence among Jewish people in the United States. (p. 407)
A)
True
B)
False
5
Individuals with PKU lack an enzyme for the metabolism of phenylalanine. (p. 407)
A)
True
B)
False
6
Individuals with PKU must be on a diet throughout their lives. (p. 407)
A)
True
B)
False
7
For genetic diseases, dominant and recessive alleles have different patterns of inheritance as demonstrated by pedigree charts. (p. 409)
A)
True
B)
False
8
When two people with medium-brown skin reproduce with one another, the children will all have medium-brown skin. (p. 411)
A)
True
B)
False
9
The Rh factor is inherited jointly with A, B, AB, or O blood types. (p. 412)
A)
True
B)
False
10
Sickle-cell disease is controlled by incompletely dominant alleles. (p. 413)
A)
True
B)
False
11
In Africa, where malaria occurs, infants with sickle-cell trait have a better chance of survival than the normal homozygote. (p. 413)
A)
True
B)
False
12
Regarding x-linked recessive genetic conditions, both males and females are affected with equal frequency. (p. 414)
A)
True
B)
False
13
Color-blind females are rare because they must receive the allele from both parents. (p. 414)
A)
True
B)
False
14
The lack of a protein called dystrophin causes the most common form of muscular dystrophy. (p. 415)
A)
True
B)
False
2002 McGraw-Hill Higher Education
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