BIOL 202 Study Guide - Transposable Element, Chromosome, Polyadenylation

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14 Jul 2014
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New phenotypes in corn produced through the movement of the ds transposable element. Had weird segregation, breakage only occurred when another locus activator" was also present. Chromosome breakage at dissociator (ds) locus, chromo fragment is lost. Required presence of unlinked activator (ac) locus recessive alleles on the homologous chromosome are expressed. Affect only a single gene distal to usual breakage point insertion of ds in c gene creates colorless excision of ds from c gene expresses color again (through action of ac) Suggested that ds is mobile, but only in the presence of ac. Some lines of corn had rare events where you cut just one of those phenotypes affected. Found an unstable allele affecting only one of the genes. As if ds was jumping into colorless and then out again to give it spots (and still needed. Unstable mutations of white from cross like what we have seen before (mutation in white gene, get white eyes instead of red)

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