Chapter 12 Practice: Question Preview (ID: 366)

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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 circle
b) unshaded square
c) unshaded circle
d) shaded square

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) 1/2
b) none of the above
c) 3/4
d) 1/4

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) codominance
c) incomplete dominance
d) simple dominant heredity

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) 0%
c) 25%
d) 50%

Many traits, such as stem length, are controlled by multiple genes. This is called _____.
a) simple dominance inheritance
b) codominance
c) polygenic inheritance
d) mongenic inheritance

Which of the following traits is controlled by the X-linked inheritance?
a) hemophilia
b) sickle-cell anemia
c) blood type
d) none of the above

A chart of an individual's chromosome pair is called a karyotype. Analysis of a karyotype can reveal which of the following?
a) phenotype
b) genotype
c) trisomy
d) all of the above

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) simple recessive heredity
b) codomiance
c) incomplete dominance
d) simple dominant heredity

Down Syndrome is called by which condition?
a) monsomy 21
b) trisomy 21
c) monosomy 23
d) trisomy 23

Karyotypes are better to diagnose which type of genetic defects?
a) point mutations
b) frameshift mutations
c) chromosomal mutations
d) cancer

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