Huntington Disease Is a Dominantly Inherited Disorder

question 25

Essay

Huntington disease is a dominantly inherited disorder.What is the probability that a child will have Huntington disease if the father and the mother are both heterozygous? Use a Punnett square to show your work and use the letters "D" and "d" to designate dominant and recessive alleles,respectively.

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Definitions:

Retroactive Interference

A phenomenon where newly learned information interferes with the recall of previously learned information.

Directed Forgetting

A psychological process in which individuals intentionally try to forget information, revealing the active control people have over their memory.

Eyewitness Testimony

Evidence provided by people who witnessed a particular event or crime, which can be highly influential but sometimes unreliable.

Motivated Forgetting

A psychological theory suggesting individuals may forget unwanted information as a mechanism to deal with emotional distress or conflict.