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biology 0610printed 258 · PDF 258
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(d) Scientists have discovered that genes are responsible for wing length in reed warblers.
The most common length of wing has been 66-67 mm for many generations of these
birds.
Explain how natural selection may be responsible for maintaining the mean wing length
of reed warblers at 66-67 mm.
[4]
[Total: 17]
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