Use the following information and graph to answer the question.
The figure below 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).

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

Question

Use the following information and graph to answer the question.
The figure below 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).

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

Quizplus · Accepted Answer

At Time C, the DNA content is decreasing due to degradation of DNA that was not retained in the recipient's chromosome. This means that some of the DNA fragments from the Hfr cell did not get exchanged with the recipient's chromosome and therefore are being degraded.

Use the Following Information and Graph to Answer the Question