Which of the following is NOT a form of regulation of gene expression?
a. transcriptional regulation
b. translational regulation
c. pretranscriptional regulation
d. posttranscriptional regulation
e. posttranslational regulation
C
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About thirteen different species of finches inhabit the Galàpagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago
About thirteen different species of finches inhabit the Galápagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago. Genetically, there are four distinct lineages, but the thirteen species are currently classified among three genera. The first lineage to diverge from the ancestral lineage was the warbler finch (genus Certhidea). Next to diverge was the vegetarian finch (genus Camarhynchus), followed by five tree finch species (also in genus Camarhynchus) and six ground finch species (genus Geospiza). If the six ground finch species have evolved most recently, then which of these is the most logical prediction? A) They should be limited to the six islands that most recently emerged from the sea. B) Their genomes should be more similar to each other than are the genomes of the five tree finch species. C) They should share fewer anatomical homologies with each other than they share with the tree finches. D) The chances of hybridization between two ground finch species should be less than the chances of hybridization between two tree finch species.
A key difference between single-gene traits such as those Mendel studied and complex traits such as human height is that:
A. complex traits are generally uninfluenced by the environment, whereas single-gene traits have a significant environmental component. B. single-gene traits are generally uninfluenced by the environment, whereas complex traits have a significant environmental component. C. complex traits show incomplete dominance, whereas single-gene traits show simple dominance. D. single-gene traits show both simple and incomplete dominance, whereas complex traits show only simple dominance. E. None of these choices describe differences between single-gene and complex traits.
The primary difference between mitosis and meiosis in animals includes all of the following except
a. the generation of haploid cells from diploid cells. b. the number of daughter cells that result (2 or 4). c. the number of times chromosomes align at the metaphase plate. d. the purpose of generating reproductive cells as opposed to generating somatic cells. e. the number of times the DNA is replicated.
Which of the following has increased as a direct result of stratospheric ozone depletion?
a. CO2 b. UVB c. CFCs d. nitrous oxides e. sulfur oxides