Download A Closer Look at Genes and Genetic Engineering (Introduction by Michael Anderson PDF

By Michael Anderson

Even supposing we regularly seek social and ancient files for clues to our prior, organic files might be carry crucial proof of our historical past. The qualities we inherit from our mom and dad and move directly to our offspring are encoded in our genes and DNA and show a lot approximately either our origins and our destiny. This quantity examines the attention-grabbing biology at the back of genetics and genetic issues. It additionally rigorously considers the rules of gene manipulation and genetic engineering whose capability to revolutionize medication, undefined, and agriculture is turning into more and more obvious with each new discovery.

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Inside the host cells, the plasmids replicate when the bacteria replicate. Because this produces many copies of the recombinant DNA molecule, recombinant DNA technology is often called gene cloning. In addition, when the bacteria’s DNA initiates protein synthesis, the protein coded for by the inserted gene is produced. 62 C hapter 5 Applications of Genetic Engineering B ecause genetic engineering is a relatively new technology, scientists are still exploring its wealth of potential applications.

Most persons with the sickle cell trait have no symptoms of disease. An estimated 1 in 12 blacks worldwide carries the sickle-cell trait, while about 1 in 400 has sickle-cell disease. If both parents have the sickle-cell trait, the chances are 1 in 4 that a child born to them will develop sickle-cell disease. Autosomal recessive disorders occur when two copies of a mutant recessive gene are inherited. Cystic fibrosis is an autosomal recessive disease in which a single mutation causes thick mucus to build up in the lungs and airways, producing severe respiratory problems.

During most of the cell cycle, homologous chromosome pairs are unreplicated. When the chromosomes replicate, each chromosome of the pair becomes doubled. Each “half ” of the doubled chromosomes is called a chromatid. During the first meiotic division, the homologous pairs of replicated chromosomes separate into two daughter cells. During the second meiotic division, the sister chromatids of each chromosome separate. Encyclopædia Britannica, Inc. 38 The Nature of Chromosomes and Genes final result is four daughter cells, each with a haploid chromosome number.

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