What is the genotype with lowest frequency?

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SUMMARY

The genotype with the lowest frequency in the discussed context is genotype (d), which is determined to have a frequency of 0%. This conclusion arises from the impossibility of transforming recipient bacterial DNA with a DNA segment where only two terminal genes recombine while the central gene remains unchanged. The discussion emphasizes the significance of multiple crossover events during recombination, as illustrated in figure 9-10 from the NCBI resource.

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Homework Statement
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The right answer is (d).

But unlike the Q which asks which one has the least frequency, I think the frequency of this genotype (d) will be 0%. Because it is not possible to transform the recipient bacterial DNA with a DNA segment where only two terminal genes recombine but the central gene does not.
Please clarify if I'm wrong.
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SanjuktaGhosh said:
Homework Statement:: NA
Relevant Equations:: The right answer is (d).

But unlike the Q which asks which one has the least frequency, I think the frequency of this genotype (d) will be 0%. Because it is not possible to transform the recipient bacterial DNA with a DNA segment where only two terminal genes recombine but the central gene does not.
Please clarify if I'm wrong.

View attachment 263135

It is possible for multiple crossover events to occur during recombination. See for example, figure 9-10 in https://www.ncbi.nlm.nih.gov/books/NBK21351/#_A1413_
 
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