BIO 2133 Chapter Notes - Chapter 9.1-9.3: Carl Correns, Chloroplast Dna, Nuclear Dna
13 Mar 2017
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Document Summary
Occasional reports challenge the basic rules of mendelian transmission genetics that is the theory that the phenotype is transmitted by nuclear genes located on the chromosomes of both parents. Some inheritance patterns fail to reflect mendelian principles. Some indicate an apparent extranuclear influence on the phenotype. Increasing knowledge, discovery of dna in the mitochondria and chloroplasts helps us see that extranuclear inheritance in important. Organelle heredity: dna contained in mitochondria or chloroplasts determines certain phenotypic characteristics of offspring often recognized on the basis of the uniparental transmission of these organelles. Infectious heredity: results from a symbiotic or parasitic association from a microorganism inherited phenotype is affected by the presence of the microorganism in the cytoplasm of the host cells through the ooplasm to offspring. Maternal effect: nuclear gene products are stored in the egg then transmitted. Commonality = transmission of genetic information through the cytoplasm rather than through the nucleus, most often from only one of the parents.
