Figure 272 Depicts Changes to the Amount of DNA Present in in a Recipient

question 3

Multiple Choice

Figure 27.2 depicts changes to the amount of DNA present in a recipient cell that is engaged in conjugation with an Hfr cell. Hfr-cell DNA begins entering the recipient cell at Time A. Assume that reciprocal crossing-over occurs (i.e., a fragment of the recipient's chromosome is exchanged for a homologous fragment from the Hfr cell's DNA) . Use Figure 27.2 to answer the following questions.

Figure 27.2
-Which question, arising from the results depicted in Figure 27.2, is most interesting from a genetic perspective, and has the greatest potential to increase our knowledge base?

• A)If reciprocal crossing-over could occur even if the piece of donated Hfr DNA is identical to the homologous portion of the recipient's chromosome, what prevents this from occurring?
• B)Why do geneticists refer to the same structure by at least three different names: sex pilus, mating bridge, and conjugation tube? Why all the jargon?
• C)What forces are generally responsible for disrupting the mating bridge?
• D)How is it that a recipient cell does not necessarily become an Hfr cell as the result of conjugation with an Hfr cell?
• E)What makes a cell an "Hfr cell"?

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