By Benjamin A. Pierce
Учебник по генетике.
Welcome to Genetics necessities: options and Connections, a quick genetics textbook designed particularly on your one-semester direction. through the 3 versions of my extra complete textual content, Genetics: A Conceptual Approach,my aim was once to aid scholars be aware of the massive photo of genetics. In writing Genetics necessities, i needed to proceed to take advantage of key innovations to steer scholars in getting to know genetics, yet with a extra concentrated approach.
Each bankruptcy of Genetics necessities has been streamlined, however the textual content nonetheless keeps the positive aspects that experience made Genetics: A Conceptual method winning: seamlessly merged textual content and illustrations, a powerful emphasis on challenge fixing, and, most significantly, a robust specialize in the suggestions and connections that make genetics significant for college kids.
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Additional resources for Genetics Essentials. Concepts and Connections
11 Preformationism was a popular idea of inheritance in the seventeenth and eighteenth centuries. Shown here is a drawing of a homunculus inside a sperm. ] composed of cells, cells arise only from preexisting cells, and the cell is the fundamental unit of structure and function in living organisms. Biologists began to examine cells to see how traits were transmitted in the course of cell division. 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 1859.
14 Genes are carried on chromosomes. A chromosome, shown here, consists of a DNA complexed to protein and may carry genetic information for many traits. ] 11 12 Chapter 1 • Genetic information is transferred from DNA to RNA to protein. Many genes encode traits by specifying the structure of proteins. Genetic information is first transcribed from DNA into RNA, and then RNA is translated into the amino acid sequence of a protein. • Some traits are affected by multiple factors. Some traits are influenced by multiple genes that interact in complex ways with environmental factors.
The nuclear membrane reforms around each set of chromosomes, producing two separate nuclei within the cell. The chromosomes relax and lengthen, once again disappearing from view. In many cells, division of the cytoplasm (cytokinesis) is simultaneous with telophase. 1. Features of the cell cycle Stage Major Features G0 phase Stable, nondividing period of variable length. Interphase G1 phase Growth and development of the cell; G1/S checkpoint. S phase Synthesis of DNA. G2 phase Preparation for division; G2/M checkpoint.