In corn, having ligules (L) is dominant to liguleless (l), and green leaves (G) is dominant to white leaves (g). If a pure-breeding liguleless plant with green leaves is crossed to pure-breeding plant with ligules and white leaves, predict the proportion of F2 progeny with the genotype Ll gg.
A) 1/16
B) 1/8
C) 1/4
D) 1/2
E) Cannot be determined
B) 1/8
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A hemophiliac contains adequate numbers of platelets. Why does he therefore have trouble with clot
formation?
What will be an ideal response?How do sodium-potassium pumps work?
a. Sodium is pumped into the cell and potassium diffuses out. b. Sodium is pumped out of the cell and potassium diffuses in. c. Sodium and potassium are both pumped into the cell simultaneously. d. Sodium and potassium are both pumped out of the cell simultaneously. e. Sodium only binds to the pump to make it receptive to potassium which then is pumped into the cell.
A moth species is known for its unusual flying behavior, which includes sudden vertical drops and horizontal zigzags. Not much is known about the cause of this behavior. What could you study to better understand the proximate basis of this behavior? (Check all that apply)
Lepidopterans (moths and butterflies) sometimes have specialized flying behaviors. Some moths have the ability to do sudden vertical drops when they detect bat sonar, to avoid being eaten. Other species use special flying techniques to attract a mate. When biologists talk about the "cause" of a behavior, they may be referring to two different things. The proximate cause is the sequence of physiological events that lead to the behavior in an individual. The ultimate cause is the adaptive benefit to the animal that allowed natural selection to sculpt the behavior over evolutionary time. Understanding both the proximate and ultimate basis of behavior is important, and different types of biologists may focus on each. _____ brain structure _____ flying behavior in related species _____ hormones _____ mating behavior _____ physiology _____ predation _____ sensory organs _____ wing muscle development Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about proximate causes of a behavior? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Chronic inflammation caused by infectious agents can increase the chance of cancer because immune cells fighting the infection
A) induce conversion of the RAS proto-oncogene to the oncogene in neighboring cells. B) secrete metalloproteinases that digest holes in the surrounding extracellular matrix. C) secrete phorbol esters. D) secrete an oncogenic form of a growth factor. E) produce mutagenic oxygen-free radicals.