Without Genetic Variation, Evolution Cannot Occur

question 69

Multiple Choice

Without genetic variation, evolution cannot occur. Sexual reproduction leads to increased genetic variation, but male bdelloid rotifers have never been observed. Which of the following are correct statements with regard to evolution in bdelloid rotifers?

• A) As we learn more about bdelloid rotifers, we find males in more and more species.
• B) Bdelloid rotifers gain genetic variation by absorbing DNA from the external environment.
• C) Protists infect bdelloids and bring DNA from other rotifers with them.
• D) Bdelloid rotifers have lost the ability to reproduce sexually only recently.

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Definitions:

Allison TC10

A specific model of automatic transmission by Allison Transmission, designed for commercial vehicles.

Torque Converter

A fluid coupling consisting an impeller, stator, and turbine used to transmit driving torque from an engine to transmission; it provides continuously variable drive ratios and can multiply torque.

Countershafts

Secondary shafts in a gearbox that carry gears of various sizes, affecting the gear ratio between the input and output shafts.

Allison TC10

A model of automatic transmission for commercial vehicles, offering fuel efficiency and durability, designed by Allison Transmission.