72) Male long-tailed widowbirds have unusually long tails, about 20 : 1380851

72) Male long-tailed widowbirds have unusually long tails, about 20 : 1380851.

 

72) Male long-tailed widowbirds have unusually long tails, about 20 inches in length, whereas the females have short tails. In an experiment with long-tailed widowbirds, one group of males had their tails clipped to 5 inches, a second group were left with normal 20-inch tails, and a third group had their tails lengthened to 30 inches by gluing on feathers clipped from the tails of other birds. If sexual selection is responsible for the males having such long tails, predict what will happen when similar numbers of females are placed in the territories of each group of males.

 

73) The concept of evolution has always been connected with some notion of progress–natural selection pushing populations toward better and better adaptations to create “perfect organisms.” How would you argue that evolution does not craft perfect organisms?

Refer to the figure below, and then answer the question that follows.

 

 

74) Human birth weights are an example of:

A) disruptive selection.

B) stabilizing selection.

C) directional selection.

D) sexual selection.

Refer to the figure below, and then answer the question that follows.

 

 

75) The changes in cranial capacity over the course of human evolution are an example of:

A) disruptive selection.

B) stabilizing selection.

C) directional selection.

D) sexual selection.

 

 

 

72) Male long-tailed widowbirds have unusually long tails, about 20 : 1380851

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