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gh1991 gh1991
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Posts: 108
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10 years ago
1)Below are two histograms showing guppy coloration in two different streams, Stream North and Stream South. Use these histograms to answer the first two questions.
Q1. Which spot brightness level is most heavily represented in Stream North?

Q2. In which stream is average spot brightness highest: Stream North or Stream South?

Stream North.
Stream South.

Q3. Darwin's theory of natural selection is based on which of the following assumptions? (Check all that apply.)

Variability
Inheritance
Differential survival
Sexual reproduction

Q4. Which of the following options best summarizes Endler's greenhouse pond experiment? Variation in adult male coloration among ponds was due to:

The populations initially having different coloration.
Differences in the hunting patterns of predators.
The loss of spots in some populations due to a mutation.
Variable preferences by female guppies causing divergent sexual selection.

Q5. Fill in the blanks in the following sentence by selecting an option from below. Cichlids tend to prey on ______________ guppies, while Rivulus mainly prey on _____________ guppies.

Adult; juvenile
Juvenile; adult
Male; female
Female; male

Q6. Which of the following locations was not indicated as part of the natural range of guppies, Poecilia reticulata?

Venezuela.
Trinidad.
Tobago.
Columbia.

Q7. In Endler's study, after 20 months, what was the average number of spots on fish in the control pond?

10
11
12
13

Q8. Which of the following best describes the change in coloration observed in male guppies?

A mutation in the male guppies occurred when predators were present.
The male guppies change their coloration when they see a predator.
Male guppies with more showy coloration tend to be eaten more often.
When females are in the presence of predators, they tend to give birth to less showy male guppies.

Q9. Imagine a different system in which toads had a wide range of variation in color. In some ponds, most of the toads are light in color. In other ponds, the average color is fairly dark. From the options below, select which represent TESTABLE hypotheses that could explain this difference in coloration. (Check all that apply.)

A predator that is present in some ponds prefers one color to the other.
Female toads in some ponds prefer darker toads, while females in another pond prefer lighter toads.
Toad color is determined by food quality, which varies pond to pond.
Toads can change their color, based on their stress level.

Q10. An evolutionary biologist studying the toads in Question 9 hypothesizes that female toads prefer like-colored mates, and this preference maintains observed variation in toad color among ponds. Such mating is called assortative; in this case it would mean that light-colored females prefer light-colored males, and dark-colored females prefer dark-colored males.

The biologist has already determined that color is highly heritable for these toads. She rears toads in experimental tanks with no predators, over many generations, holding food quality constant. Which observation below best REFUTES her hypothesis?

A tank initially containing light and dark toads of both genders eventually contains only dark toads.
A tank initially containing light-colored females and males of both colors eventually contains only dark toads.
A tank initially containing dark-colored females and males of both colors eventually contains only dark toads.
A tank initially containing light-colored females and dark-colored males eventually contains toads of intermediate coloration.
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how_mendelhow_mendel
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Posts: 1827
10 years ago
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Have you done any of this so far?

Quote
Q3. Darwin's theory of natural selection is based on which of the following assumptions? (Check all that apply.)

Variability
Inheritance
Differential survival
Sexual reproduction

Let's first focus on following postulated of Darwin theory of natural selection.

1) Individuals within species are variable;
2) Some of these variations are passed on to offspring;
3) In every generation, more offspring are produced than can survive; and
3) The survival and reproduction of individuals are not random; the individuals who survive and go on to reproduce the most are those with the most favorable variation, and they are naturally selected.

Quote
Q8. Which of the following best describes the change in coloration observed in male guppies?

A mutation in the male guppies occurred when predators were present.
The male guppies change their coloration when they see a predator.
Male guppies with more showy coloration tend to be eaten more often.
When females are in the presence of predators, they tend to give birth to less showy male guppies.

More bright color of male guppies attract more females for the reproduction. More bright colors in male guppies offers them to pass their genes to the next progeny. At the same time, more bright colored male guppies have the chances to get caught by the predators. Several studies have shown that more bright colored male guppies are more likely to be eaten by the predators as compared to less bright colored male guppies. Predators are more attracted towards bright colored male guppies.

The correct answer is "Male guppies with more showy coloration tend to be eaten more often".

Quote
Q10. An evolutionary biologist studying the toads in Question 9 hypothesizes that female toads prefer like-colored mates, and this preference maintains observed variation in toad color among ponds. Such mating is called assortative; in this case it would mean that light-colored females prefer light-colored males, and dark-colored females prefer dark-colored males.

The biologist has already determined that color is highly heritable for these toads. She rears toads in experimental tanks with no predators, over many generations, holding food quality constant. Which observation below best REFUTES her hypothesis?

A tank initially containing light and dark toads of both genders eventually contains only dark toads.
A tank initially containing light-colored females and males of both colors eventually contains only dark toads.
A tank initially containing dark-colored females and males of both colors eventually contains only dark toads.
A tank initially containing light-colored females and dark-colored males eventually contains toads of intermediate coloration.

A tank initially containing light - colored females and dark colored males eventually contains toads of intermediate coloration.

Color is highly heritable in toads this was determined by the biologist to prove this hypothesis the best explanation would be A tank initially containing dark colored males and light colored females eventually contains toads of intermediate coloration. Because one of the main function of color is they protect them from predator by Camouflage. Since in the tank their are no predators both the color toads can have same survival rate and mate each other in the absence of like color toads. And since the color is highly heritable genes from. Both male and female share their characters i.e light and dark color to their next generation due to their is a Intermediate coloration in the upcoming generation. Hence we can see that Initially the tank containing light color females and dark color malea eventually contains toads of intermediate coloration.

All the other option don't stand as a perfect explanation for that hypothesis. Because they don't provide any clarified information about the inheritance of color.
This verified answer contains over 670 words.
Biology!

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wrote...
10 years ago
no not yet, i need help on the questions
wrote...
Educator
10 years ago
Q2. In which stream is average spot brightness highest: Stream North or Stream South?

Stream North.
Stream South.

Looks to me like the South stream, according to the graph, of course.
scalp
wrote...
10 years ago
I agree. According to the graph, the average of the south stream is much higher than the average of the north stream. I chose south also
wrote...
10 years ago
@meagan.n.gilbert: Could you post the other questions Crying Face I could really use this!
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A year ago
thank you
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A year ago
Thank you.
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A year ago
thank you
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A year ago
thank you
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A year ago
Thank you.
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A year ago
#biolife!!!!!!!!
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A year ago
Thanks for looking out! #biolifeforlife
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A year ago
thanks
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