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Chapter 12 Practice
Test Description: Practice Questions for Chapter 12
Instructions: Answer all questions to get your test result.
1) You and your colleagues are constructing a pedigree for a patient with cystic fibrosis. The individual's brother has also been diagnosed with cystic fibrosis. How would this brother be represented in the pedigree?
A
shaded square
B
shaded circle
C
unshaded square
D
unshaded circle
2) A man carrying the allele for Huntington's disease marries a woman who is homozygous recessive for the allele. What is the probability that their offspring will develoop Huntington's disease?
A
1/4
B
none of the above
C
3/4
D
1/2
3) An individual has type AB blood. His father has type A blood and his mother has type B blood. The individual's phenotype is an example of ____.
A
simple recessive heredity
B
simple dominant heredity
C
incomplete dominance
D
codominance
4) A newly discovered disease is caused by an extremely rare allele of a gene on the X chromosome. The disease is 100% lethal. A female carrier of the allele decides to have children. What percentage of female embryos will die from this disease?
A
100%
B
25%
C
50%
D
0%
5) Many traits, such as stem length, are controlled by multiple genes. This is called _____.
A
polygenic inheritance
B
simple dominance inheritance
C
mongenic inheritance
D
codominance
6) Which of the following traits is controlled by the X-linked inheritance?
A
blood type
B
hemophilia
C
sickle-cell anemia
D
none of the above
7) A chart of an individual's chromosome pair is called a karyotype. Analysis of a karyotype can reveal which of the following?
A
trisomy
B
phenotype
C
all of the above
D
genotype
8) A couple has a child who, with respect to a specific trait, resembles neither parent. Which of the following is NOT a possible mechanism for this trait?
A
codomiance
B
simple recessive heredity
C
simple dominant heredity
D
incomplete dominance
9) Down Syndrome is called by which condition?
A
trisomy 23
B
monosomy 23
C
trisomy 21
D
monsomy 21
10) Karyotypes are better to diagnose which type of genetic defects?
A
frameshift mutations
B
point mutations
C
cancer
D
chromosomal mutations
*select an answer for all questions
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