How does position effect influence gene expression?
A. Point mutations in promoters frequently occur by this mechanism
B. Translocations may result in a promoter that is normally used for one gene now controlling an entirely different gene
C. Since this mechanism relies on recombination it relies on the positioning of one allele so that it is under the control of the other allele.
D. Translocations always result in a gene being recombined into an area of heterochromatin.
B
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What causes tidal overmixing in estuaries?
a. strong tidal currents. b. strong river flow. c. an unstable water column. d. downwelling. e. animal migrations.
Which of the following is LEAST characteristic of the pelvic girdle?
a. thick bones b. strong ligaments c. designed for wide range of movements d. attaches legs to axial skeleton e. weight bearing stress
Explain why stromatolites are believed to hold a clue to the origin of the first prokaryotic cells on Earth during the Precambrian Era.
What will be an ideal response?
The finding that homeotic genes are present in both mammals and insects indicates that these genes must
A. have arisen very early in the evolutionary history of animals. B. control the same traits. C. have developed independently and simultaneously. D. have been transmitted into mammals by an insect bite. E. be on the same chromosomes.