Horizontal gene transfer between host organisms and their symbionts
A) happens frequently because of coevolution.
B) causes genome reduction in the symbiont and genome expansion in the host.
C) causes genome reduction in both the host and the symbiont.
D) has been observed, but is considered a rare event.
Answer: D
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When one plant is shaded by another, why is the ratio of far-red to red light increased compared to an unshaded plant?
A. Phytochrome in the taller plant absorbs most of the red light. B. Auxin absorbs mostly far-red light. C. As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll. D. Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed. E. Shade is enriched in far-red wavelengths of light.
How do gene duplication and exon shuffling lead to new genes?
What will be an ideal response?
Scientists have been able to clone
a. sheep. b. cats. c. rabbits. d. pigs. e. all of these.
How many haploid sets of chromosomes are present in an individual cell that is tetraploid (4n)?
What will be an ideal response?