In a Transformation Experiment in the Bacterium Streptococcus, the Donor

question 28

Multiple Choice

In a transformation experiment in the bacterium Streptococcus, the donor has the genotype d⁺e⁺f⁺ (order is not known) . The recipient strain is d^-e^-f^- and f⁺ transformants are selected for. The complete genotype is determined for each of the f⁺ transformants and the results are shown below. What is the cotransformation frequency between f and e? $\begin{array} { l c } Genotype&Number~ of ~transformants\\\\a ^ { + } e ^ { + } f ^ { + } & 25 \\ a ^ { + } e ^ { - f ^ { + } } & 4 \\ a ^ { - } e ^ { + } f ^ { + } & 80 \\ a ^ { - } e ^ { - } f ^ { + } & 256 \end{array}$

• A) 28.8%
• B) 71.2%
• C) 7.9%
• D) 23.0%
• E) 40.6%

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Definitions:

Family Level

A classification rank in biological taxonomy that groups together related genera, a level above genus and below order.

Classification

The process of organizing or categorizing objects or entities based on shared characteristics or traits.

Terrestrial

Pertaining to or representing the land as opposed to water or air.

Monocot

One of two classes of flowering plants; monocot seeds contain a single cotyledon, or seed leaf. Compare with eudicot.