What term describes all alleles of all the genes in a population?
a. genome tree
b. genetic family
c. gene reservoir
d. gene pool
e. allele collection
d
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You leave for winter vacation and forget to water your plants for two whole weeks! You also turned down the heat and closed the blinds. What hormone is most likely to be produced in response to these conditions?
A. Gibberellins. B. Abscisic acid. C. Cytokinins. D. Auxins.
Multicellular haploid organisms
A) are typically called sporophytes. B) produce new cells for growth by meiosis. C) produce gametes by mitosis. D) are found only in aquatic environments. E) are the direct result of fertilization
If C4 photosynthesis prevents photorespiration, why haven't all plants evolved to use the C4 pathway?
A) C4 produces some toxic by-products. B) C4 is not advantageous in all climates. C) All plants will evolve to be C4 in time. D) C4 is advantageous only in high-oxygen habitats. E) Only some plants use C4 photosynthesis.
The components of the second line of defense against microbes may be characterized as
A) responders to invasion. B) passive barriers. C) mechanisms to strengthen the first line of defense. D) detecting the unique features of specific pathogens. E) both passive barriers and detecting specific pathogen features.