For Some Rare Autosomal Dominant Diseases, It Is Possible That

question 1

Essay

For some rare autosomal dominant diseases, it is possible that the dominant homozygote has never been seen. One reason is that the fetus with this genotype may die early in development and be spontaneously aborted. In fact, roughly 25% of all women will have a pregnancy end in spontaneous abortion at some point during their lifetimes. Consider a situation in which
Q/Q dies as an early fetus; Q/q lives to reproduce but is unaffected; q/q lives and is unaffected. What genotypes are possible among live-born children of the mating Q/q × Q/q? (Hint: Construct a 2-by-2 table to reflect the genotypes of the parents.)

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Definitions:

Payback

The period of time required for the return on an investment to "repay" the sum of the original investment.

Time Value of Money

The theory that current money holds more value than equal amounts in the future because of the earnings it could potentially produce.

Specified Point in Time

Refers to a particular moment or exact date that is identified for an event or action to occur.

Payback Period

The period of time required for the return on an investment to "pay back" the sum of the original investment.