“Ancestry tests” are sold by many companies. There are significant

limitations to these tests. Why is this the case?

-High genetic variation among individuals within most populations makes it difficult to identify specific sequences that can reliably indicate membership in a population.
-Evaluating too few genetic loci, of which just a small number happen to be similar, can lead to the conclusion that individuals are much more genetically similar than they actually are.
-A DNA match between two individuals living today is not a match with an ancestor. Rather, it suggests that the two people may have inherited the DNA sequence from a common ancestor.
-High rates of gene flow between populations reduce the reliability with which any sequence can demonstrate membership in one particular population.
-all of these are limitations to “Ancestry tests”

For which of the following is there clear evidence that a single gene mutation is the cause of the associated disorder?

-A mutation in the FOXP2 gene causes speech disorders
-A mutation in the gene that encodes Happy Hour causes alcoholism
-A mutation in the MAOA gene causes aggression
-A mutation in the HD gene causes Huntington Disorder
-A mutation in the Complement Component 4 gene causes Schizophrenia

What is the function of a normal MAOA protein?

-It is a neurotransmitter
-It is an enzyme responsible for the construction of neurotransmitter receptors
-It is an enzyme essential in the formation of certain neurotransmitters
-It carries neurotransmitters across synapses
-It breaks down neurotransmitters and clears them from the synaptic cleft

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