By Michael Anderson
Even supposing we regularly seek social and old files for clues to our earlier, organic records possibly carry an important facts of our history. The qualities we inherit from our mom and dad and cross directly to our offspring are encoded in our genes and DNA and display a lot approximately either our origins and our destiny. This quantity examines the interesting biology at the back of genetics and genetic problems. It additionally conscientiously considers the foundations of gene manipulation and genetic engineering whose capability to revolutionize drugs, undefined, and agriculture is changing into more and more obtrusive with each new discovery.
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Additional resources for A Closer Look at Genes and Genetic Engineering (Introduction to Biology)
Mitosis is the process in which one cell divides into two identical cells. ” Jupiterimages/Photos. com/Thinkstock 36 The Nature of Chromosomes and Genes Mitosis Unicellular organisms such as bacteria and the somatic cells of higher organisms replicate through mitosis, a process in which one cell gives rise to two genetically identical daughter cells. The chromosomes make exact copies of themselves, after which the duplicate sets separate as the cell divides, with one full set of chromosomes going into each of the two daughter cells.
A parent who possesses a balanced translocation—a chromosome rearrangement with no extra genetic material from chromosome 21—can pass the translocation to an offspring. Carriers of balanced translocations 51 A Closer Look at Genes and Genetic Engineering do not have signs or symptoms of the disorder. Mothers carrying a translocation have a 12 percent risk of transmitting the genetic rearrangement to their offspring, whereas fathers carrying a translocation have a 3 percent risk of transmission.
A change in the DNA sequence causes the wrong amino acid to be added to the protein. In some instances this has no major effect; however, in many cases the change causes severe problems, ranging from birth defects to cancer or death. 43 C hapter 3 Genetic Disorders D iseases that arise from abnormalities in the genetic material are termed genetic disorders. Many genetic disorders are apparent during infancy; others are not evident until adulthood. Genetic disorders may result from mutations, or changes in the DNA sequence, of a single gene or defects in an entire chromosome.
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