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Evolution and Genetics of Roses

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We know that all modern roses were developed from the wild five-petal variety. Not only do modern roses have many more petals, but they have a much larger number of chromosomes. Explain how this probably came about.

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Short paragraph examining the evolution and genetics of modern roses. Web references provided.

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To create modern roses selective breeding was used to propagate desired traits such as petal number, scent, hardiness, etc. Examination of rose genetics reveals increases in chromosome number. ...

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