A particular gene that controls seed coat color in peas also determines the susceptibility of these peas to a particular
disease. This situation is referred to as:
a. variegation.
b. polygenic inheritance.
c. codominance.
d. pleiotropy.
e. incomplete dominance.
d
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What is the cyncytium?
a. rod-like structures discharged from mucus in free-living flatworms b. a layer of cells formed by nuclear division without cytokinesis c. a layer of fused cells that covers muscle layers in flatworms d. a nerve structure associated with photosensory cells in tapeworms
Where does transcription take place in a typical eukaryotic cell?
a. the nucleus b. ribosomes c. the cytoplasm d. ribosomes and the cytoplasm
A genetic change that caused a certain Hox gene to be expressed along the tip of a vertebrate limb bud instead of farther back helped make possible the evolution of the tetrapod limb. This type of change is illustrative of _____
A) the influence of environment on development B) paedomorphosis C) a change in a developmental gene or its regulation that altered the spatial organization of body parts D) heterochrony
Estimates of current rates of extinction:
A) indicate that we have reached a state of stable equilibrium in which speciation rates equal extinction rates. B) suggest that one-half of all animal and plant species may be gone by the year 2100. C) indicate that rates may be greater than the mass extinctions at the close of the Cretaceous period. D) indicate that only 1% of all of the species that have ever lived on Earth are still alive. E) suggest that rates of extinction have decreased globally.