By William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Concepts of Genetics is understood for its concentrate on educating middle suggestions and challenge fixing. This best-selling textual content has been broadly up to date, with assurance on rising issues in genetics, and problem-solving aid has been enhanced.
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Extra resources for Concepts of Genetics (10th Edition)
C. Remains of maize dating to this period have been recovered in caves in the Tehuacan Valley of Mexico. Such evidence documents our ancestors’ successful attempts to manipulate the genetic composition of species. 1 Age of Greek culture, philosophers wrote about this subject as it relates to humans. ). The Hippocratic treatise On the Seed argued that active “humors” in various parts of the male body served as the bearers of hereditary traits. Drawn from various parts of the male body to the semen and passed on to offspring, these humors could be healthy or diseased, the diseased condition accounting for the appearance of newborns with congenital disorders or deformities.
Geneticists encountered many different examples of inherited traits between 1910 and about 1940, allowing them to test the theory over and over. Patterns of inheritance sometimes varied from the simple examples described by Mendel, but the chromosome theory of inheritance could always be applied. It continues to explain how traits are passed from generation to generation in a variety of organisms, including humans. Genetic Variation At about the same time as the chromosome theory of inheritance was proposed, scientists began studying the inheritance of traits in the fruit ﬂy, Drosophila melanogaster.
Researchers in the last decades of the nineteenth century also described the behavior of chromosomes during two forms of cell division, mitosis and meiosis. In mitosis, chromosomes are copied and distributed so that each daughter cell receives a diploid set of chromosomes. Meiosis is associated with gamete formation. Cells produced by meiosis receive only one chromosome from each chromosome pair, in which case the resulting number of chromosomes is called the haploid (n) number. This reduction in chromosome number is essential if the offspring arising from the union of two parental gametes are to maintain, over the generations, a constant number of chromosomes characteristic of their parents and other members of their species.