Cloning • Catalyst: • What is a somatic cell? • What is a gamete? • What is a stem cell? • Give one example of how stem cells could be used in medicine to help people. Write in complete sentences! Don’t talk during the Catalyst!
Objectives By the end of today, all SWBAT… • Describe the steps necessary to clone organisms • Evaluate pros and cons of cloning organisms
Agenda • Catalyst • Catalyst • Cloning • Cloning • Cloning Video • Cloning Video • Cloning Debate • Cloning Debate • Exit Question • Exit Question
Cloning • Key Point #1: • Cloning is the process of creating a genetically identical copy of an organism by a somatic cell nuclear transfer.
Sure, Mr. LY. What does this look like in real life though? • I'M GLAD YOU ASKED!!!!
Steps of a Somatic Cell Transfer • The nucleus is removed from an egg • The nucleus is removed from the cell that needs to be cloned • The nucleus from the cell that needs to be cloned is put into the empty egg. • It is given a jolt of electricity, causing it to divide and grow.
Species that have been successfully cloned to date • Tadpole: 1952 • Carp: 1963 • Sheep: 1996 – FIRST ADULT ANIMAL TO BE CLONED. • Cat: 2002 • Mule: 2003 • Horse: 2005 • Camel: 2005 • Rhesus Monkey: 2007 • Human: ????
Why clone animals? • Key Point #2: • There are many reasons to clone animals. • Save endangered species • San Diego Zoo • Audubon Zoo • Bring extinct species back to life • Nutritious and delicious food
Implications of cloning • In 2007, scientists cloned a rhesus monkey embryo and harvested monkey stem cells. • 2 minutes, Pair-Share • How would society change if we could clone humans?
Cloning • Key Point #3: • We can clone human embryos to harvest embryonic stem cells for research • Dissect the embryo to remove stem cells • No worries about the immune system rejecting the stem cells
Stem Cell Video • You should be able to answer the questions on the worksheet. • Head up, pay attention. • Keep these questions in mind: • What are we trying to do with cloned human cells? • What are the potential benefits? • What are the ethical issues? • WHOA! A LOT TO THINK ABOUT.
Prompt #1 It is morally acceptable to clone animals (for any of the reasons we have discussed today)
Prompt #3 Since a blastocyst is as big as the tip of a pin, it should not be considered to be a human life.
Prompt #2 People should be able to destroy embryos to improve the life of already living humans.
Prompt #4 Cloning humans is unnatural and should not be pursued.
Prompt #5 Overall, the benefits of cloning (humans and animals) outweigh the negative consequences.
Worksheet • Independent work time on the worksheet
Key Point Wrap-Up • Key Point #1: Cloning is the process of creating a genetically identical copy of an organism by a somatic cell nuclear transfer. • Key Point #2: There are many reasons to clone animals. • Key Point #3: We can clone human embryos to harvest stem cells for research.
Exit Questions Describe the four steps necessary to clone an organism. Write in complete sentences! Don’t talk during the Exit Question!