Hfr cell

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/hfr-cell

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the integration mechanism?Homologous recombination between plasmid and chromosomal DNA
2. What is the primary function?Efficient transfer of chromosomal DNA during conjugation
3. How does an Hfr cell share its DNA with other bacteria?During conjugation, the integrated plasmid starts to copy and pull the chromosome along. It sends a long piece of DNA to the partner cell before the connection breaks.
4. Why are Hfr cells important for scientists?Because they transfer DNA in a predictable order, scientists can map where genes are on the chromosome by timing how long it takes each gene to arrive.

Episome: A genetic element that can replicate independently or integrate into the host chromosome.
Conjugation: The direct transfer of genetic material from one bacterium to another through cell-to-cell contact.
Homologous Recombination: A DNA repair and genetic recombination mechanism involving the exchange of genetic information between similar DNA molecules.