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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 8, Problem 21QP
Textbook Problem
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Which of the following statements is not true about DNA replication?

  1. a. It occurs during the M phase of the cell cycle.
  2. b. It makes a sister chromatid.
  3. c. It denatures DNA strands.
  4. d. It occurs semiconservatively.
  5. e. It follows base-pairing rules.

Summary Introduction

Introduction: DNA replication is a multistep complex process in which many components take part to complete the synthesis of a new complementary DNA strand. DNA replication occurs during cell division.

Explanation of Solution

Reason for correct answer:

DNA replication begins in the synthesis phase (S phase) of interphase during the cell division, which occurs before the mitotic phase (M phase). Prophase (initial phase of mitosis) starts with two sister chromatids, which are the result of DNA replication. Hence, DNA replication has been completed before the beginning of the M phase during the cell division.

DNA replication starts in the S (synthesis) phase of interphase before mitosis. DNA has been replicated by the time mitosis begins. Prophase (initial phase of mitosis) starts with two sister chromatids, which are the replicated DNA molecules.

Option a. is given as “It occurs during the M phase of the cell cycle.”

DNA replication occurs during the S phase of the cell cycle before the mitosis (M) phase. Hence, the correct answer is option a.

Reasons for incorrect answer:

Option b. is given as, “It makes a sister chromatid.”

Chromosomes are replicated during the S phase of mitosis...

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