Which would be the best way to directly test the hypothesis that
C. stellatus (a species of barnacle) is competitively excluded from the lower intertidal zone by B. balanoides (another species of barnacle)?
A) Place individuals of each species in a jar and see which species survives.
B) Remove all B. balanoides from the lower intertidal zone.
C) Transplant B. balanoides to the upper intertidal zone.
D) Clear rocks in an entire area and document recolonization events.
E) Remove all C. stellatus from the upper tidal zone.
Answer: B
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The relatively high percentage of individuals in West Africa who are heterozygous for the sickle cell trait is an
example of _____. a. natural selection b. genetic drift c. spontaneous mutational spread d. heterozygote disadvantage e. the founder effect
Which of the following is an example of biological trait?
A.) personality B.) hair style C.) eye color D.) regional accent
What is the difference between a tissue and an organ system?
A) An organ system includes tissues. B) Tissues are not composed of cells, but organ systems are composed of cells. C) Tissues are composed of organ systems. D) A tissue cannot exist unless it is part of an organ system, but an organ system can exist independently of tissues.
Pax6 is a transcription factor noted for its unique role in specifying eye development across the animal kingdom. A homologous gene known as eyeless specifies eyes in Drosophila, and misexpression of mouse Pax6 can cause ectopic eyes in flies! This creates a quandary - how can we explain the universality of the master regulatory gene for eye development, with the striking variability of eye anatomy in different phyla?Misexpression of the Pax6 gene was shown to promote eye development in both vertebrates and invertebrates. The authors of this study suggested that this was evidence that eyes evolved only once. What other evidence contradicts this view?
A. Invertebrates normally have only simple eyespots. B. The anatomical structure of insect, mollusk, and vertebrate eyes are quite different. C. Many different transcription factors can initiate eye development when misexpressed. D. While the anatomy of all animal eyes is the same, lens proteins vary greatly.