Prader-Willi and Angelman syndromes both arise from the same area of chromosome 15, illustrating
A) epistasis.
B) X inactivation.
C) genomic imprinting.
D) behavior modification.
C) genomic imprinting.
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The unique characteristics of an individual's iris pattern may be compared to the unique characteristics
of a person's a. facial features. b. height and weight combination. c. fingerprints. d. hair color. e. hair pattern.
Vascular plants and air-breathing animals first appeared during which time period?
a. Silurian period b. Permian period c. Cambrian period d. Ordovician period e. Cretaceous period
What condition best describes the endogeneity problem?
A. The distribution of the errors (Ui) is non-normal. B. One of the Xi variables is correlated with the error term (Ui). C. Some variables within Xi are perfectly correlated with other variables in Xi. D. The variance of the errors (Ui) depends on Xi.
When might it be the case that a difference-in-differences estimator still does not identify a consistent estimate of the causal treatment effect?
A. If there are non-time varying effects that generate differences between treated and non-treated groups. B. If there are time varying effects that generate amongst both treated and non-treated groups symmetrically. C. If there are time-varying trends that are different amongst treated and non-treated groups. D. If the treatment is non-normally distributed.