Genetics: A Conceptual Approach , Second Edition by Benjamin A. Pierce
By Benjamin A. Pierce
Designed for introductory genetics classes and according to many years of training adventure, Genetics: A Conceptual technique makes a speciality of the $64000 innovations and mechanics of genetics with out wasting scholars in a sea of element.
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Extra info for Genetics: A Conceptual Approach , Second Edition
Charles Darwin (1809–1882), one of the most influential biologists of the nineteenth century, put forth the theory of evolution through natural selection and published his ideas in On the Origin of Species in 1856. Darwin recognized that heredity was fundamental to evolution, and he conducted extensive genetic crosses with pigeons and other organisms. However, he never understood the nature of inheritance, and this lack of understanding was a major omission in his theory of evolution. In the last half of the nineteenth century, the invention of the microtome (for cutting thin sections of tissue for microscopic examination) and the development of improved histological stains stimulated a flurry of cytological research.
The same cannot be said for human cells. Errors in chromosome separation, producing cells with too many or too few chromosomes, are frequently catastrophic, leading to cancer, reproductive failure, or—sometimes—a child with severe handicaps. This chapter explores the process of cell reproduction and how a complete set of genetic information is transmitted to new cells. In prokaryotic cells, this process is simple, because prokaryotic cells possess a single chromosome. In eukaryotic cells, multiple chromosomes must be copied and distributed to each of the new cells, and so the process is more complex.
A) pangenesis; (b) the inheritance of acquired characteristics; (c) preformationism; (d) blending inheritance. 15 16 Chapter 1 CHALLENGE QUESTIONS 23. Describe some of the ways in which your own genetic makeup affects you as a person. Be as specific as you can. *24. Suppose that life exists elsewhere in the universe. All life must contain some type of genetic information, but alien genomes might not consist of nucleic acids and have the same features as those found in the genomes of life on Earth.