You cross a pink snapdragon (CRCW) with a white snapdragon (CWCW). What percentage of the
progeny will be red?
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%
A
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Ehrlich and Raven proposed an "escape and radiate" hypothesis that predicts that:
A. plants that escape their herbivores will radiate, increasing diversity. B. plants that are not eaten will develop more similar traits. C. plants and insects co-evolve toward less species diversity. D. plants will only win the evolutionary "arms race" if they escape to new habitats. E. plants and insects are showing less diversity through time as each adapts to the other's defenses.
How is it that humans can perceive multiple sounds at once?
a. Each portion of the basilar membrane vibrates at a unique frequency, and multiple regions can be stimulated at the same time. b. The more frequencies of sounds that are present, the further the sound travels into the cochlea. c. We have two ears, each perceiving a subset of frequencies in the environment. d. The fluid in the middle ear can transmit multiple frequencies to the oval window. e. Sounds reaching the left or right ear result in different nerve impulses.
Which statement about the internal biological clock is not true:a
is known as a circadian rhythm. b. is related to the opening and closing of stomata. c. includes the sleep movements observed in some plants, such as beans. d. may involve both phytochrome and cryptochrome. e. disappears abruptly if it is not reset by the rising and setting sun.
Nucleotide analogs are a class of drugs that are highly effective against many types of viruses. They work by halting the replication of viral genes. They are equally effective at stopping the spread of prion diseases.
Answer the following statement true (T) or false (F)