You are observing a peacock displaying at least once per hour. You observe a second peacock that displays once per day. If displaying is an honest signal for peacock condition, how do we interpret these displays? A) The female would produce more fit offspring by mating with the first peacock. B) The female would produce more fit offspring by mating with the second peacock. C) The first male was desperate to find a mate before all of the good breeding grounds are taken. D) Females do not care about displays. E) There is probably a predator nearby and the second peacock is much smarter about not drawing attention to himself.
Added by Stephanie M.
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Step 1: The fact that the first peacock displays at least once per hour suggests that it is in good condition and has the energy to display frequently. Show more…
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The photo shows a male peacock displaying his beautiful feathers. How does this behavior affect the peacock's chances of successfully reproducing? O A. It signals to other male birds that this bird wants to cooperate. B. It is an example of camouflage and protection from predators. C. It is a way of protecting young birds from harm. D. It increases the bird's chances of finding a mate.
Sri K.
Iridescent peacock feathers are shown in Figure $\mathrm{P} 38.56 \mathrm{a}$ . The surface of one microscopic barbule is composed of transparent keratin that supports rods of dark brown melanin in a regular lattice, represented in Figure $\mathrm{P} 38.56 \mathrm{b}$ . (Your fingernails are made of keratin, and melanin is the dark pigment giving color to human skin.) In a portion of the feather that can appear turquoise, assume that the melanin rods are uniformly separated by $0.25 \mu \mathrm{m},$ with air between them. (a) Explain how this structure can appear blue-green when it contains no blue or green pigment. (b) Explain how it can also appear violet if light falls on it in a different direction. (c) Explain how it can present different colors to your two eyes at the same time-a characteristic of iridescence. (d) A compact disc can appear to be any color of the rainbow. Explain why this portion of the feather cannot appear yellow or red. (e) What could be different about the array of melanin rods in a portion of the feather that does appear to be red?
Iridescent peacock feathers are shown in Figure $\mathrm{P} 37.44 \mathrm{a}$. The surface of one microscopic barbule is composed of transparent keratin that supports rods of dark brown melanin in a regular lattice, represented in Figure $\mathrm{P} 37.44 \mathrm{~b}$. (Your fingernails are made of keratin, and melanin is the dark pigment giving color to human skin.) In a portion of the feather that can appear turquoise (blue-green), assume the melanin rods are uniformly separated by $0.25 \mu \mathrm{m}$, with air between them. (a) Explain how this structure can appear turquoise when it contains no blue or green pigment. (b) Explain how it can also appear violet if light falls on it in a different direction. (c) Explain how it can present different colors to your two eyes simultaneously, which is a characteristic of iridescence. (d) A compact disc can appear to be any color of the rainbow. Explain why the portion of the feather in Figure $\mathrm{P} 37.44 \mathrm{~b}$ cannot appear yellow or red. (e) What could be different about the array of melanin rods in a portion of the feather that does appear to be red?
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