What are the two key assumptions necessary to establish causality from a regression model?
A. Targeted sample of participants and random assignment of the treatment
B. Random sample of participants and random assignment of the treatment
C. Random sample of participants and targeted assignment of the treatment
D. Targeted sample of participants and targeted assignment of the treatment
Answer: B
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The migratory neural crest cells _____
A) form most of the central nervous system B) form the spinal cord in the frog C) form a variety of neural and non-neural structures D) form the lining of the lungs and of the digestive tract
Transovarian transmission is a process in which
A. a pathogen infects the ovaries of the host. B. a pathogen is transmitted to the host when the host ingests contaminated eggs. C. an infected female vector transmits the pathogen to the eggs forming in its ovaries. D. the pathogen is transmitted from an infected male to a healthy female during mating. E. the pathogen is spread from one host to the next by unprotected sexual intercourse.
In sweet peas, genes C and P are necessary for
colored flowers. In the absence of either (__ pp or cc __) or both (cc pp), the flowers are white. Give the probable genotype of a plant with colored flowers and a plant with white flowers that produced 38 plants with colored flowers and 42 plants with white flowers. What will be an ideal response?
An autosome:
A: cannot be a sex chromosome. B: is a circular chromosome. C: is dioecious. D: is always present in one copy in males. E: must be a sex chromosome.