Lenski and Travisano Compared What Happened to the Fitness of Cells

question 9

Multiple Choice

Lenski and Travisano compared what happened to the fitness of cells in 12 replicate lines of E.coli.According to the graphs above,which of the following statements is (are) true?

• A)After only 500 generations, natural selection had already increased fitness in the evolving strains.
• B)Average fitness decreased substantially over the first 2000 to 3000 generations.
• C)Average fitness increased substantially over the first 2000 to 3000 generations.
• D)A and B
• E)A and C

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Definitions:

Gravida

A term used in obstetrics to refer to a pregnant woman; often used in medical context to specify the number of pregnancies a woman has had.

Myometritis

An inflammation of the myometrium, the muscular layer of the uterus, often resulting from infection.

Endometritis

Inflammation of the inner lining of the uterus.

Vaginitis

Inflammation of the vagina that can result in discharge, itching, and pain, often caused by infection.