Huntington's Disease Is Caused by a Single Dominant Allele

question 31

Multiple Choice

Huntington's disease is caused by a single dominant allele.It is a lethal disease, yet it persists in the human population.Which of the following statements best describes why?

• A)Huntington's disease is sex-linked and every human has at least one X chromosome; thus, the chances are extremely high for this allele to be maintained in the human population.
• B)Huntington's disease can present symptoms so mild that they appear to lack dominant expression of the allele in some individuals; in those cases, the allele is passed on to the offspring.
• C)While lethal to a parent, Huntington's disease will not be lethal to the offspring since it can skip a generation.
• D)Huntington's disease presents symptoms in mid-life, after most people have already had offspring.

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Definitions:

Federal Deficit

The amount by which the government's total budget outlays exceed its total receipts for a fiscal year.

Discretionary Fiscal Policy

Government policy involving deliberate manipulation of government spending and taxes to influence the economy based on current economic conditions.

Aggregate Demand

Aggregate demand is the total demand for all goods and services within an economy at a given overall price level and in a given time period.

Multiplier Effect

The phenomenon where an initial change in spending leads to a greater overall change in income and output in the economy.