Figure 24.2 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 24.2 to answer the following question(s).
Figure 24.2
-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 24.2 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 24.2 to answer the following question(s).
  Figure 24.2
-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

The DNA content is decreasing at time C because some of the DNA that entered the recipient cell during conjugation was not retained in the recipient's chromosome but instead degraded.

Figure 242 Depicts Changes to the Amount of DNA Present in in a Recipient