Dll is a gene known to direct limb development in the fruit fly
Researchers studying this gene have found that it is also expressed in developing appendages in animals from many other phyla, supporting the hypothesis that all animal appendages may be homologous. However, suppose researchers looking at Dll activity had instead found the results shown in the figure above. These results suggest instead that _____.
A) Dll is not actually involved in appendage development
B) appendages evolved separately in protostomes and deuterostomes
C) appendages coevolved with segmentation
D) all animal appendages are homologous
Answer: B
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of amphibians worldwide?
a. loss of habitat b. increased UV light from climate change c. chemical pollutants d. pathogens e. all of these are causing the decline of amphibians worldwide
A(n) __________ bacterium would not be able to survive in the presence of oxygen
a. facultative aerobic b. facultative anaerobic c. facultative autotrophic d. obligate aerobic e. obligate anaerobic
Common vectors used to transfer a piece of DNA into a cloning host are
A. bacteriophages. B. artificial chromosomes. C. viruses. D. plasmids. E. All of the choices are correct.
The taste receptors located in the fruit fly, Drosophila melanogaster, are located in the _____
1.mouth
2.antennae
3.abdomen
4.feet