In replicationbinds to the origin of replication cauning a short section of DNA to unwind. O DraA proteins nitition proteins) O DNA helicase (DraB) O Single stranded binding proteins O topoisomerase O DNA polymerase

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Question: In replication, ____ binds to the origin of replication causing a short section of DNA to unwind.**

**Options:**

- DnaA proteins (initiation proteins)
- DNA helicase (DnaB)
- Single stranded binding proteins
- topoisomerase
- DNA polymerase
Transcribed Image Text:**Question: In replication, ____ binds to the origin of replication causing a short section of DNA to unwind.** **Options:** - DnaA proteins (initiation proteins) - DNA helicase (DnaB) - Single stranded binding proteins - topoisomerase - DNA polymerase
**Understanding Crossing Over in Genetics**

**Question:**
When does crossing over occur?

**Answer Choices:**
- O Prophase of mitosis
- O Prophase I of meiosis
- O Prophase of mitosis and prophase I of meiosis
- O Prophase I and prophase II of meiosis

---

**Explanation:**

**Crossing over** is a significant genetic process that occurs during meiosis, which is essential for producing genetic diversity in offspring. This process involves the exchange of genetic material between homologous chromosomes and occurs during **prophase I of meiosis**. It does not occur during prophase of mitosis or other phases of meiosis.

Understanding when crossing over occurs helps students grasp how genetic variation arises during sexual reproduction, leading to the unique combinations of traits seen in populations.

For further in-depth learning, students are encouraged to explore the stages of meiosis and differentiate them from those of mitosis to understand the specificity of crossing over to meiosis.
Transcribed Image Text:**Understanding Crossing Over in Genetics** **Question:** When does crossing over occur? **Answer Choices:** - O Prophase of mitosis - O Prophase I of meiosis - O Prophase of mitosis and prophase I of meiosis - O Prophase I and prophase II of meiosis --- **Explanation:** **Crossing over** is a significant genetic process that occurs during meiosis, which is essential for producing genetic diversity in offspring. This process involves the exchange of genetic material between homologous chromosomes and occurs during **prophase I of meiosis**. It does not occur during prophase of mitosis or other phases of meiosis. Understanding when crossing over occurs helps students grasp how genetic variation arises during sexual reproduction, leading to the unique combinations of traits seen in populations. For further in-depth learning, students are encouraged to explore the stages of meiosis and differentiate them from those of mitosis to understand the specificity of crossing over to meiosis.
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