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.
Monozygotic Twins
These monolithic figures from Easter Island suggest the contemplative nature of philosophy, which ca
The 31 pairs of spinal nerves.
The RecA strand exchange reaction as shown from single-molecule studies
Cross-Sectional Studies
Stages of mitosis. Only two pairs of chromosomes from a diploid (2n)