Biology Homework Chapter 11: Cloning and Cancer
Textbook assignment: Chapter 11: The Control of Genetic Expression, sections 12-19.
- 11.12 Plant cloning is a common way of propagating plants without worrying about the possibility of misbreeding them. Plant cells retain all their genetic potential and in many cases, we can grow a whole plant (leaves, stems and roots) from only one type of tissue (roots, for example). [This is why mowing dandelions makes your weed problem worse.]
- 11.13 Nuclear cloning methods. Even adult DNA strands contain all the genetic material for an organism. When placed in an embryonic cell, the resulting offspring cells will produce an animal which is genetically identical (a clone) of the parent source.
- 11.14 Stem cell research. While embryonic stem cells retain their ability to differentiate into more tissue types than adult stem cells, harvesting embryonic stem cells has until recently resulted in the destruction of embryos. New research is leading to promising methods of increasing the ability to use adult stem cells and avoid the ethical issues of embryonic stem cell use.
- 11.15 Cancer mutations. Most forms of cancer arise from mutations in somatic (body, non-gametic) cells that cause the mutated cells to lose their ability to control mitotic reproduction.
- 11.16 Mechanisms leading to the development of cancerMore than one such change is required to give rise to most malignant cancers, so such diseases generally occur in older patients.
- 11.17 Malfunctioning proteins can interfere with signal transductio. One way that cancers arise occurs when a tumor suppressant gene is turned off, and the tumor suppressing factor or protein is either not produced, or not produced effectively.
- 11.18 Chemicals introduced as part of normal or extraordinary life styles (eating habits, drug use) that can cause somatic cell mutations leading to cancer are carcinogens, which can be inorganic materials like tobacco smoke or salt, organiic nutrients such as alcohol, normal hormones in abnormal amounts, or viruses. Individuals can reduce their risk for cancer by choosing diets and lifestyles that limit the intake of carcinogenic substances. Proactive testing can also ensure that treatments begin when they can be effective in limiting damage or removing the cancer entirely.
Read the following weblecture before chat: Differentiation of Cells
Take notes on any questions you have, and be prepared to discuss the lecture in chat.
Perform the study activity below:
- Required: Complete the Mastery Exercise with a score of 85% or better.
- Optional: Test yourself with the textbook multiple choice questions and note any that you miss that still don't make sense. Bring questions to chat!
- Go to the Moodle and take the quiz for this chapter.
Read through the lab for this week; bring questions to chat on any aspect of the lab, whether you intend not perform it or not. If you decide to perform the lab, be sure to submit your report by the posted due date.
© 2005 - 2019 This course is offered through Scholars Online, a non-profit organization supporting classical Christian education through online courses. Permission to copy course content (lessons and labs) for personal study is granted to students currently or formerly enrolled in the course through Scholars Online. Reproduction for any other purpose, without the express written consent of the author, is prohibited.