Which of the following has NOT been observed as a trait of sperm competition?
A) applying pheromones that reduce the female's attractiveness
B) the production of large ejaculates containing many sperm
C) depositing a copulatory plug
D) prolonged copulation during mating
E) All of the above have been observed as traits of sperm competition.
E
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The vertebrate jaw first appeared in which organism?
a. fishes b. amphibians c. reptiles d. birds e. mammals
Agrobacterium tumefaciens is often used in the production of transgenic plants because of its Ti plasmid
This plasmid is usually "disarmed" by deleting its tumor genes along with the genes for producing what products that would have been advantageous to the bacterium?
In a strawberry plant in the summer, the leaves are ________ and the strawberry fruits are ________
A) sugar sources… sugar sources B) sugar sources… sugar sinks C) sugar sinks… sugar sources D) sugar sinks… sugar sinks
Which of the following is a relationship between organisms that cannot evolve into a mutualistic relation-ship?
a. parasite–host interaction b. predator–prey interaction c. neutral interaction d. none; any interaction can serve as a precursor