Studies of the offspring of nonschizophrenic co-twins from discordant twin pairs suggest that
A) genetic factors cause schizophrenia, while environmental factors are essentially unimportant.
B) the heritability of schizophrenia involves the transmission of a single dominant gene.
C) a genetic predisposition to schizophrenia may remain unexpressed in some individuals unless it is
released by some unknown environmental factors.
D) environmental factors play a more important role than genetic factors in the origin of schizophrenia.
Question 2
Harold and Tanya both have a wide range of schizophrenic symptoms that came on rather suddenly.
Harold's symptoms have lasted for eight months; Tanya's have lasted only eight weeks. According to the
DSM-IV their diagnoses should be
A) schizophreniform disorder for Harold; brief psychotic disorder for Tanya.
B) undifferentiated schizophrenia for Harold; schizophreniform disorder for Tanya.
C) schizoaffective disorder for Harold; schizophreniform disorder for Tanya.
D) disorganized schizophrenia for Harold; undifferentiated schizophrenia for Tanya.
The seven phenotypic pairs studied by Mendel
Pairs of heavy and light chains combine to form a Y-shaped molecule
The RecA strand exchange reaction as shown from single-molecule studies
Cross-Sectional Studies
homework help health studies
Ball-and-stick models of A=T and G≡C base pairs