Homeostasis is
a. the ability to sense and response to change
b. maintaining an internal environment within
parameters that favor survival
c. essential for all living things
d. not found in nonliving things
e. all of these
E
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Based on the ABC model, what would be the structure of a flower from the outermost whorl that had normal expression of genes A and C and expression of gene B in all four whorls?
A) carpelâ€"petalâ€"petalâ€"carpel B) petalâ€"petalâ€"stamenâ€"stamen C) sepalâ€"carpelâ€"carpelâ€"sepal D) sepalâ€"sepalâ€"carpelâ€"carpel E) carpelâ€"carpelâ€"carpelâ€"carpel
The African clawed frog (Xenopus laevis) is allotetraploid, likely as a result of an interspecies mating long ago, followed by a duplication of the entire genome. Xenopus laevis is fertile and has a normal life cycle
In contrast, mules, the allodiploid offspring of a male donkey and a female horse, are generally sterile. Why can Xenopus reproduce and mules cannot? A. Frogs are less sensitive to multiple copies of the genome than mammals. B. In allotetraploid organisms each chromosome has a chromosome to pair up with in meiosis, whereas in allodiploid organisms they do not C. The two frogs that interbred to form the Xenopus laevis must have been more closely genetically related than the donkey and horse are. D. The mule must have a genetic mutation that prevents it from reproducing.
If wire hair (W) is dominant to smooth hair (w) and you find a wire-haired puppy, how would you
determine its genotype by a genetic breeding experiment? Give both the genotype and phenotype involved with the cross with the unknown. What will be an ideal response?
Which is a combination of physiological and psychological dependence?
Select one: a. tolerance and withdrawal b. increasing a drug to get the same effect and preoccupation with trying to get more drugs c. seizures and craving for cocaine d. the rush of cocaine and the hallucinations of marijuana e. a cocaine binge and a nicotine craving