In contrast developing seeds that bear at least one

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Unformatted text preview: ater internally, and ultimately results in the wrinkled appearance of the seed at maturation. In contrast, developing seeds that bear at least one copy of the normal gene (being either homozygous or heterozygous for the dominant allele) synthesize starch and reach an osmotic balance that minimizes the loss of water. The end result is a smooth-textured outer coat. The SBEI gene has been cloned and analyzed, providing greater insight into the relationship between genotypes and phenotypes. Interestingly, the mutant gene contains a foreign sequence of some 800 base pairs that disrupts the normal coding sequence. This foreign segment closely resembles other such sequences, called transposable elements. These sequences have the ability to move from place to place in the genome of organisms. Transposable elements have been found in maize (corn), parsley, and snapdragons, fruit flies, and humans, among many other organisms. Wrinkled and round garden peas, the phenotypic traits in one of Mendel’s monohybrid crosses. 5 11/29/12 Carattere autosomico recessivo Aa Aa Aa A= allele wt a = allele “mutante” Aa aa Aa...
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