A Permissive Bacterial Strain Is Simultaneously Infected with Two Strains

question 22

Multiple Choice

A permissive bacterial strain is simultaneously infected with two strains of T4-like phage.One phage strain has the genotype a^-b⁺,while the other is a⁺b^-.If the map distance between markers a and b is about 10 map units,what proportion of the progeny phages are expected to have the genotype a⁺b⁺?

• A)about 1/20
• B)about 1/10
• C)about 4/10
• D)about 4/5
• E)about 9/10

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Definitions:

Magnetic Fields

Invisible fields that exert force on objects that possess magnetic properties or are conducting electricity, influencing their orientation and behavior.

REM Sleep

A phase of sleep characterized by rapid eye movement, where dreaming occurs and the body undergoes a variety of changes, including increased brain activity.

Color

The attribute of visual perception described through hue, saturation, and brightness, as determined by the spectral composition of light.

Black and White

Thinking characterized by absolute terms, seeing everything as one extreme or the other with no middle ground.