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Exam 21: Patterns of Genetic Inheritance

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Question 1

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Which of the following is not a characteristic of an autosomal dominant disorder pedigree?

A) Affected children will usually have unaffected parents.
B) Heterozygotes are affected.
C) Two affected parents can produce an unaffected child.
D) Both males and females are affected with equal frequency.
E) Two unaffected parents will not have affected children.

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Question 2

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How is familial hypercholesterolemia inherited?

A) autosomal recessive
B) autosomal dominant
C) incompletely dominant
D) codominant
E) sex-linked dominant

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Question 3

Multiple Choice

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In a pedigree,an affected male would be designated by

Which of the following disorders is caused by a defect in the production of an elastic connective tissue protein called fibrillin?

How are Fragile X syndrome and Huntington disease similar?

There is a single gene that controls the ability to taste PTC paper.The ability to taste is dominant to the inability to taste.If you can taste the paper,it is very bitter.Which of the following genotypes can taste the paper?

In a cross of a homozygous dominant parent and a homozygous recessive parent,what is the ratio of offspring that will exhibit the recessive phenotype?

If a person with type B blood marries a person with type A blood,what phenotypes can their children be?

Which of the following is not an autosomal recessive disorder?

Which of the following is not a characteristic of an X-linked recessive disorder pedigree?

Which of the following traits would not be considered multifactorial?

What is the genotype of a person with type O blood?

Which of the following represents a cross to determine if an individual is homozygous dominant or heterozygous?

Even though sickle-cell disease is inherited as an autosomal recessive disorder,the heterozygote can express some variation of the recessive phenotype.

Which of the following would not be a common/conventional way to list someone's genotype?

Explain the problems associated with the genetic disorder Tay-Sachs. A. This lysosome is responsible for clearing out the fatty acids that build up in the cells of the brain. The buildup begins to interfere with proper brain development and growth. This leads to malfunctions in vision, movement, hearing, and overall mental development. The impairment leads to blindness, seizures, paralysis, and death.

The definition of a multifactorial trait is one in which more than one set of alleles is involved,in which the environment plays no role.

In a dihybrid cross,in which both parents are heterozygous for both traits,what is the probability that the offspring will exhibit both of the dominant phenotypes?

Which of the following is an example of a homozygous recessive genotype?

If you want to know the probability that tossing two coins will result in a particular outcome (two heads,for example) ,you use the