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Unformatted text preview: spineless ( ss ) recessive to normal ( ss + ) 4. All three loci are on the 3 rd chromosome 5. Gene order assigned arbitrarily. Any dominant phenotypes in the offspring result from a dominant allele inherited from the triple heterozygote ("TH"). 1. Which progeny received a nonrecombinant chromosome from TH? 2. Which progeny received a double recombinant chromosome from TH? Bio 352 2 of 2 3. The remaining 4 phenotypes received a chromosome with one crossover. Determine gene order : Which gene is in the middle? 1. Draw 3 different TH chromosomes – each with a different locus in the middle. 2. Double crossover each one and see which produces double crossover progeny observed. Mapping the three genes 1. Calculate distance between st and ss by counting all the recombinants between these two loci. 4. Calculate distance between ss and e . 5. Construct the map. Next Time : EXAM 1 (Good luck!)...
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- Spring '08
- different TH chromosomes, Thee-point testcross Biases, 2-point testcross Distance, double recombinant chromosome