Chapter_15_Outline - Chapter 15- The Chromosomal Basis of...

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Chapter 15- The Chromosomal Basis of Inheritance I. Relating Mendelism to Chromosomes A. Observations of cytologists and geneticists provided the basis for the chromosome theory of inheritance by noting the parallels between the behavior of chromosomes and the behavior of Mendel’s factors. B. Around 1902, Walter S. Sutton, Theodor Boveri, and others began to form the chromosome theory of inheritance. In early 20 th century, Thomas Hunt Morgan was the first to associate a specific gene with a specific chromosome. C. Dorosophila melanogaster is a good experimental organism because they are common, generally innocuous, and prolific breeders. D. sex-linked genes - a gene located on a sex chromosome. linked genes - genes that are located on the same chromosome. The inheritance of linked genes is different from independent assortment because these genes tend to be inherited together in genetic crosses. E. Parental types - offspring with a phenotype that matches one of the parental phenotypes. Recombinants - an offspring whose phenotype differs from that of the parents. F. Linked genes do not assort independently because they are located on the same chromosomes and tend to move together through meiosis and fertilization. G. Crossing over can unlink genes when the recombinant chromosomes resulting from crossing over bring together alleles in new combinations, and later on meiosis distributes the recombinant chromosomes to gametes. H.
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Chapter_15_Outline - Chapter 15- The Chromosomal Basis of...

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