Multiple Choice
Which pair of genes is expected to have the highest recombination rate during meiosis?
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4. Genetic Mapping and Linkage
Mapping Overview
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In the context of bacterial genetic mapping, what does it mean if the trp gene is said to be located at 26 minutes on the E. coli chromosome?
A
The trp gene is positioned 26 minutes from the origin of replication, based on the time it takes for gene transfer during conjugation.
B
The trp gene is located 26 base pairs from the origin of replication.
C
The trp gene is transcribed every 26 minutes.
D
The trp gene is expressed for 26 minutes during the cell cycle.
Verified step by step guidance1
Understand that bacterial genetic mapping often uses a time-based system called the 'minutes map' to indicate gene positions on the circular chromosome of E. coli.
Recognize that the 'minutes' refer to the time it takes for a gene to be transferred from a donor to a recipient cell during conjugation, starting from a defined origin of transfer.
Know that the E. coli chromosome is circular and approximately 100 minutes long in this mapping system, where 1 minute corresponds roughly to 1% of the chromosome.
Interpret the statement 'the trp gene is located at 26 minutes' to mean that the trp gene is transferred 26 minutes after the origin of transfer begins during conjugation.
Conclude that this time measurement reflects the relative position of the trp gene on the chromosome, not the physical distance in base pairs or the timing of transcription or expression.
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