Male peacocks with larger eyespots are more attractive to females than males with smaller eyespots
The two figures below show mean weight (at a certain age) and percent survival of offspring as a function of the father's eyespot size. Are these results consistent with the hypothesis that eyespots are an "honest signal?" Justify your answer.
What will be an ideal response?
ANS:
Yes, males with larger eyespots tend to father larger chicks with a higher rate of sur-vival. Eyespot size appears to be an indicator of a male's "good genes."
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Geological evidence reveals that the atmosphere on Earth originally lacked oxygen. What process initiated the build-up of oxygen in the atmosphere?
a. Fixing carbon dioxide from the atmosphere resulted in oxygen being emitted. b. The formation of ATP and harvesting of the energy in chemical bonds resulted in oxygen being released. c. Water, used as a hydrogen source, resulted in oxygen as a waste product. d. The first terrestrial plants utilized carbon dioxide and gave off oxygen, just like plants today.
A shortened snout and a relatively flat face are associated with
A. bilateral symmetry and aquatic reproduction. B. a decline in the importance of smell and an increase in reliance on vision. C. a terrestrial life style. D. a decline in the importance of vision and an increase in reliance on smell.
The accumulation of free oxygen in the atmosphere ____.
A. was a result of the accumulation of a by-product of a type of photosynthesis B. caused the further spontaneous generation of life C. provided the opportunity to extract more energy through anaerobic respiration D. occurred immediately after the earth was formed E. allowed for DNA to replace RNA as the primary data storage molecule
Which of the following bacterial genera is useful for sewage treatment?
A) Burkholderia B) Thiobacillus C) Neisseria D) Zoogloea E) Nitrosomonas