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 (in other words, 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
-What is occurring at Time C that is decreasing the DNA content?
A) crossing over
B) cytokinesis
C) meiosis
D) degradation of DNA that was not retained in the recipient's chromosome
E) reversal of the direction of conjugation

Question

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 (in other words, 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
-What is occurring at Time C that is decreasing the DNA content?
A) crossing over 
B) cytokinesis 
C) meiosis 
D) degradation of DNA that was not retained in the recipient's chromosome 
E) reversal of the direction of conjugation

Quizplus · Accepted Answer

At Time C, the DNA content is decreasing because the recipient cell is degrading the DNA that was not retained in its chromosome. This is indicated by the decrease in DNA content after reaching a maximum at Time B.

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