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Why is a 50 percent recovery of single-crossover products the
upper limit, even when crossing over always occurs between two
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- WHY IS A 50% RECOVERY OF SINGLE-CROSSOVER PRODUCTS THE UPPER LIMIT, EVEN WHEN CROSSINGOVER ALWAYS OCCURS BETWEEN TWO LINKED GENES?Explain why a 50 percent recovery of single-crossover products is the upper limit, even when crossing over always occurs between two linked genes?If interference is complete (i.e., 100% effective), what is the frequency of double crossovers one should expect? Enter a number rounded to two decimal places.
- Draw a preliminary linkage map of the three loci. What is their order? (E.g. is the forked locus between yellow and cross-veinless, or outside this region?) As this is a preliminary linkage map - do not account for double crossovers. You should base the distances on this map off your map distances calculated: yellow and forked: 39.3 mu yellow and cross-veinless: 11.9 mu cross-veinless and forked: 33.6 muWhat is the expected number of double crossovers based on the map? What is observed number of double crossover’s based on the data in the table? Calculate the interference using the formula.. Interpret the interference in terms of whether a crossover inhibits or stimulates an additional crossover in the same interval of the chromosome?How can the product rule be used to predict the results of crosses in which multiple genes are studied simultaneously?
- In most tests of genetic linkage, the number of double crossovers is less than the number expected due to what effect, which limits the number of crossovers that can occur in a short length of chromosome?The A locus and the D locus are so tightly linked that norecombination is ever observed between them. If Ad/Ad is crossed with aD/aD and the F1 is intercrossed,what phenotypes will be seen in the F2 and in whatproportions?In tomatoes, a heterozygous plant with normal fruit and purple stems is crossed with a recessive plant having fasciated fruit and green stems (test cross). The following distribution of offspring is observed: normal fruit, purple stems 38.5% fasciated fruit, green stems 38.5% normal fruit, green stems 11.5% fasciated fruit, purple stems 11.5% What is the recombination frequency?
- A three-point testcross is carried out between three linked genes. The resulting nonrecombinant progeny are s+ r+ c+and s r c and the double-crossover progeny are s+ r+ c. Which is the middle locus?The genotypes of F1 individuals in a trihybrid cross are LlMMNn x llMmNn. What is the probability that the F2 offspring will have an LlMmnn genotype? Use the forked-line method in solving the problem.Genes A, B, and C lie at map positions 2.5, 7.5, and 17.5, respectively. In a three-point test cross, you observed 2 double crossovers in a total of 1000 progeny. What is the interference in this region?