In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over
spotted (s). If two dihybrids (Bb Ss) were crossed, what fraction of the black, solid offspring would be
homozygous?
a. 4/16
b. 9/16
c. 1/9
d. 3/16
e. 3/4
C
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How does the phenomenon of horizontal gene transfer muddle the concept of monophyletic groups?
A. Monophyletic groups are based on the concept that a particular group of species descended from a common ancestor. When horizontal gene transfer occurs in the common ancestor, any species to which it gives rise can no longer be considered descendent species. B. Monophyletic groups are based on the concept that a particular group of species descended from a common ancestor. When horizontal gene transfer occurs, not all of the genes in a species were inherited from the common ancestor. C. Monophyletic groups are based on the concept that members of a particular group of species are related to one another at a particular taxonomic rank. However, a species that undergoes horizontal gene transfer no longer belongs to that taxon and the group becomes paraphyletic. D. Monophyletic groups are based on the concept that members of a particular group of species are related to one another at a particular taxonomic rank. An unrelated species that undergoes horizontal gene transfer can become more closely related to members of a different group, making that group polyphyletic.
Currently, for any organism to be considered as an animal it must:a
show evidence of locomotion. b. not be an autotroph. c. show evidence of sexual reproduction. d. have a brain and nervous system. e. be at the tissue level of organization
Using microbes to break down or remove toxic wastes in water and soil is called
A. synergism. B. recycling. C. mineralization. D. bioremediation. E. decomposition.
The letter D indicates the ____
a. first trophic level b. second trophic level c. third trophic level d. fourth trophic level e. fifth trophic level