Some scientists have suggested that recent outbreaks of sudden oak disease could be fought through the creation of transgenic plants with genetic resistance to sudden oak disease. What would be the most likely source of this genetic resistance?
A. entirely new genes created in a lab and inserted into the oak genome
B. a species of aphid with resistance to sudden oak disease
C. the original host species in the native region of the disease
D. domesticated apple trees adapted to North America
E. other tree species with unusually high levels of host plant resistance
Answer: C
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If one is attempting to determine the influence of genes or the environment on phenotypic variation, inbred strains with individuals of a relatively homogeneous or constant genetic background are often used. Variation observed between different inbred
strains reared in a constant or homogeneous environment would likely be caused by genetic factors. What would be the source of variation observed among members of the same inbred strain reared under various environmental conditions? What will be an ideal response?
The oceans are thought to regulate temperatures of the whole planet. Explain this process in terms of the heat capacity of water
What will be an ideal response?
The bulldog ant has a diploid number of two chromosomes. Therefore, following meiosis, each daughter cell will have a single chromosome. Diversity in this species may be generated by mutations and _____
A) crossing over B) independent assortment C) crossing over and independent assortment D) nothing else
Which of the following statements is not true of protists?
A. Moisture is absolutely essential to their existence. B. They make up a substantial fraction of the marine plankton. C. They are not known to cause diseases of humans. D. Most are free living.