Each ommatidium of the compound eye of an insect has a biconvex lens and a ____, which help focus light onto
photoreceptor cells known as ____.
a. crystalline cone; retinular cells
b. facet; ocelli
c. rhabdome; cones
d. sclera; rods
e. cornea; rhodopsins
a
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A gene that determines the structure of body parts during embryonic development is a
a. homeotic gene. b. homeostatic gene. c. homologous gene. d. homeobox gene. e. homogenous gene.
The species concept that relies most heavily on the criterion that species are evolutionarily independent units that are isolated by gene flow is ________
A) the morphospecies concept B) the phylogenetic species concept C) the biological species concept D) This criterion is common to all of these concepts.
Sixty years of data from the Framingham Heart Study showed that people with low cholesterol had 50% more offspring, on average, than those with high cholesterol. Since it is known that cholesterol level is highly heritable, what can be concluded from this specific observation?
A. High cholesterol reduces an individual's fertility. B. The frequency of people with low cholesterol should increase in the U.S. population. C. Cholesterol level has a major effect on survival. D. Natural selection is largely nullified as an important evolutionary mechanism in modern human populations. E. Ethnic groups that traditionally have more children have a greater frequency of genes for low cholesterol.
During an ecology field trip to a lake, your professor asks you to take temperature readings at various depths and record your data. At 5 meters, you note a temperature of 25°C and at 10 meters you record a temperature of 10°C. Readings at 20 meters and below stay fairly consistent around 8°C. The temperature readings of 25°C, 10°C, and 8°C represent the
A. hypolimnion, thermocline, and epilimnion. B. epilimnion, thermocline, and hypolimnion. C. hypolimnion, epilimnion, and thermocline. D. epilimnion, hypolimnion, and thermocline. E. thermocline, epilimnion, and hypolimnion.