2019学年度人教版选修八Unit 2 Cloning Period 1 reading教案

(CLONING：WHERE IS IT LEADING US?)

Aims

To help students develop their reading ability

To help students learn about cloning

Procedures

I. Warming up by leaning the word "clone"

Scientist in Scotland grows "impossible" sheep from one cell of another sheep. clone

n.

1. A cell, group of cells, or organism that is descended from and genetically identical to a single common ancestor, such as a bacterial colony whose members arose from a single original cell.

2. An organism descended asexually from a single ancestor, such as a plant produced by layering or a polyp produced by budding.

3. A DNA sequence, such as a gene, that is transferred from one organism to another and replicated by genetic engineering techniques.

4. One that copies or closely resembles another, as in appearance or function: "filled with business-school clones in gray and blue suits" Michael M. Thomas.

v. cloned, clon·ing, clones

v. tr.

1. To make multiple identical copies of (a DNA sequence).

2. To create or propagate (an organism) from a clone cell: clone a sheep.

3. To reproduce or propagate asexually: clone a plant variety.

4. To produce a copy of; imitate closely: "The look has been cloned into cliché" Cathleen McGuigan.

II. Pre-reading

What is cloning?

We define cloning as production of a cell or organism with the same nuclear genome as another cell or organism.

Cloning is the process of creating an identical copy of an original. A clone in the biological sense, therefore, is a single cell (like bacteria, lymphocytes etc.) or multi-cellular organism that is genetically identical to another living organism. Sometimes this can refer to "natural" clones made either when an organism reproduces asexually or when two genetically identical individuals are produced by accident (as with identical twins), but in common parlance the clone is an identical copy by some conscious design. Also see clone (genetics).

The term clone is derived from the Greek word for "twig". In horticulture, the spelling clon was used until the twentieth century; the final e came into use to indicate the vowel is a "long o" instead of a "short o". Since the term entered the popular lexicon in a more general context, the spelling clone has been used exclusively.

III. Reading aloud to the recording

Whole language teachers affirm that reading aloud teaches you the students about