Cytogenetics Notes

A a a a source hood and antonovics 2000 heredity a a

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Unformatted text preview: es from a single meiosis usually mate with each other. A A a a Source: Hood and Antonovics 2000 Heredity a A A 1 2 A a 2 1 a AA Aa Aa 1 4 1 Chromosomal Theory of Inheritance (Theodor Boveri & Walter Sutton) 1. Every cell contains two copies of each kind of chromosome, and there are two copies of each kind of gene. 2. The chromosome complement, like Mendel's genes, appears unchanged as it is transmitted from parents to offspring through generations. 3. During meiosis, homologous chromosomes pair and then separate to different gametes, just as the alternative alleles of each gene segregate to different gametes. 4. Maternal and paternal copies of each chromosome pair move to opposite spindle poles without regard to the assortment of any other homologous chromosome pair, just as the alternative alleles of unrelated genes assort independently. 5. At fertilization, an egg's set of chromosomes unites with a randomly encountered sperm's set of chromosomes, just as alleles obtained from one parent unite at random with those from the other parent. 6. In all cells derived from the fertilized egg, one-half of the chromosomes and one-half of the genes are of maternal origin, the other half of paternal origin. Text Source: Hartwell Source: Wikimedia Commons Chromosomal Theory of Inheritance Empirical Support – Inheritance of traits can correlate with inheritance of chromosomes Source: Hartwell Chromosomal Theory of Inheritance Empirical Support – Inheritance of traits can correlate with inheritance of chromosomes Source: Hartwell How do we track the inheritance of genes on autosomes, which don’t exhibit the same obvious physical difference as sex chromosomes? How does the physical connection between genes on the same chromosome affect the Mendelian rules of inheritance?...
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This document was uploaded on 02/28/2014 for the course BZ 350 at Colorado State.

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