Transgenic mice and other model animals are used to study human neurodegenerative disorders to ________.

• develop animals with desirable traits.
• research molecular mechanisms of a human disorder.
• produce genes for gene therapy.
• produce tissues for transplantation
• all of the choices are possible reasons transgenic mice and other model animals are used to study these disorders.

The observation that schizophrenia is associated with duplications of a certain copy number variant (CNV), while autism spectrum disorders are associated with deletions of the same CNV, suggests that _____.

• neither disorder has a genetic component
• both disorders have an environmental component
• both disorders share common developmental pathways
• CNV mutations are present in all psychiatric disorders
• both disorders have identical phenotypes

Individuals with androgen insensitivity are abnormal because

• their ovarian ducts do not develop.
• they have no Mullerian ducts.
• their testes do not produce testosterone.
• they have no SRY gene.
• they are missing a receptor protein for testosterone.

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