The ________ of the retina, which is responsible for acute vision, has densely packed cone cells.
A. otolith
B. fovea centralis
C. tectorial membrane
D. blind spot
E. ampulla
Answer: B
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What is the distance between these two genes?
You are mapping the location of two genes in Drosophila, listless l and blind b. (l+ b+ b+) and (l+ l b+ b) flies are normal, but (l l b b) flies don't move around very much and cannot detect the location of a light source. You perform a testcross with a doubly heterozygous fruit fly and get the following results: listless, sighted: 100 listless, blind: 400 normal activity:, sighted 400 normal activity:, blind 100 A. They are on different chromosomes. B. They are 10 map units apart. C. They are 20 map units apart. D. They are 40 map units apart. E. They are 80 map units apart.
To identify the optimal phylogenetic tree from multiple potential trees, many systematists use the ____, which states
that the simplest plausible explanation of any phenomenon is the best.
a. maximum likelihood method b. principle of parsimony c. genetic distance method d. gradual phyletic hypothesis e. punctuated equilibrium hypothesis
Chemoautotrophs oxidize which of the following to obtain the energy necessary to reduce carbon dioxide to an organic compound?
A. ammonia B. hydrogen sulfide C. hydrogen gas D. nitrites E. All of the above.
Which of the following scenarios fits the definition of macroevolution?
a. The divergence of the eastern and western meadowlark birds into two different species b. The increase in the frequency of polydactyly (more than 10 fingers) among the Pennsylvania Amish population c. The general increase in height of the human species over the last 200 years d. The increase in milk production of cows in the early 1900s e. The changes in wing color of the peppered moth over the last 100 years