Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 10, Problem 12SQ
Summary Introduction

Introduction: A female mammal’s somatic cells consist of two X chromosomes, which are inherited from its parents. Those two chromosomes are tightly condensed and thereby one of them will get inactivated. This condensed form of X chromosome is called as a Barr body and the process of formation of Barr body is called as X chromosome inactivation. This is a normal process that takes place in the body of female mammals to equalize the expression of the sex cells.

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The characteristic “X” shape of chromosomes is _____. a. a result of maximum compaction of the chromosome b. due to the wrapping of DNA around histones c. only evident during cell division d. indicative of a cell that is no longer dividing e. only found in the female sex chromosome
1. What process enables the body to heal after an injury? a.cell cycle b.mitosis & meiosi c.meiosisd.mitosis e.none of them   2. Checkpoints in the cell cycle control system ___________.  a.stop cells from dividing b.regulate the cells by stop and go signals c.signal cells to undergo mitosis d.ensure that a cell keeps dividing   3. Which statement is TRUE about meiosis? * a.It retains the number of chromosome number. b.It reduces the chromosome number by a quarter. c.It doubles the chromosome count in gametes. d.It reduces the chromosome number by half.
Choose the option that best fits the blank. Henrietta Lacks was female, so, naturally, all the cells from her derived cancerous cell line have _________ chromosomes. A. Only X B. X and Y C. Only Y
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The Cell Cycle and its Regulation; Author: Professor Dave Explains;https://www.youtube.com/watch?v=eqJqhA8HSJ0;License: Standard YouTube License, CC-BY
Cell Division - Mitosis and Meiosis - GCSE Biology (9-1); Author: Mr Exham Biology;https://www.youtube.com/watch?v=w7vp_uRA8kw;License: Standard YouTube License, CC-BY