1) Given the map a15b24c (where 15 and 24 are the respective map distance between the loci) with a coefficient of coincidence of 0.5, how many "abc" pheontype individuals would be observed among 1000 progeny of a test cross of the following: a+c/+b+

You have determined that the gene order for three linked genes being studied is A B C. The number of recombinants resulting from crossover between genes A and BC are 44 and 48, respectively, while the double-crossover progeny total 4 and 6. What is the recombination frequency between genes A and B if the total progeny from the cross is 1000? Show all of your work.

6.7 Use frequency of crossing over to calculate the map distance between two genes. Given map distances, predict outcomes of crosses involving two or three genes.

The following recombinant frequencies were found between genes A, B, C, D, and E. Determine the order of these genes on the chromosome and draw a linkage map of this chromosome with the map units labeled. А, С: 10% А, D: 30% А, Е: 6% В, С: 4% В, D: 16% В, Е: 20% C, D: 20%

Consider the following Test Cross results & chromosome map: Test Cross Progeny 525 A   B  C 500 A+ B+C+ 456 A+ B C 308 A  B+C+ 101 A  B  C+ 100 A+ B+C 2 A+ B C+ 1 A  B+C Total Progeny = 1993   1-Based on the above data calculate the expectednumber of Double crossovers (DCOs)? Round answers to the closest whole number.

Assignment 1 A pure strain of Mendel's peas, dominant for all seven of his independently assorting genes, was testcrossed. a) How many different kinds of gametes could each of the parents produce? b) How many different gametes could the F, produce? Assignments Assignment 1 c) If the F, was testcrossed, how many phenotypes would be expected in the offspring and in what proportion? d) How many genotypes would be expected in the F,?

A purple snow pea plant known to be hybrid for three linked genes (a, b, and d) is testcrossed. The progeny phenotypes and frequencies are: +a+ 86 b+d 56 +ad 78 b++ 49 +++ 12 bad 6 ba+ 515 ++d 460   a) Draw the chromosomes of the trihybrid and tester lined mentioned above.  b) Give a map of the gene order with distance.

In D. melanogaster, reduced bristles (rd), cinnabar eyes (cn), and vestigial wings (vg) are recessive traits located on chromosome II in that order. The distance between rd and cn is 7 cM and the distance between cn and vg is 9 cM. The CoC for this chromosome is 0.9. A true-breeding female expressing cinnabar eyes and vestigial wings is crossed to a true-breeding male expressing reduced bristles. The F1 are wild type. An F1 female is then test crossed to a male expressing all three traits. Among the F2 progeny, how often would you expect to observe flies expressing only cinnabar eyes? Using the same information from above, among the F2 progeny, how often would you expect to observe flies expressing only vestigial wings?

Consider the following Test Cross results & chromosome map:    Test Cross Progeny 525 A   B  C 500 A+ B+C+ 456 A+ B C 308 A  B+C+ 101 A  B  C+ 100 A+ B+C 2 A+ B C+ 1 A  B+C Total Progeny = 1993   1-Calculate the interference.?

The order of the genes on a plant chromosome is A, B, C, where A and B are located 10 cM apart and B and C are located 3 cM apart. What is the probability that the trihybrid ABC/abc will produce any kind of recombinant gamete?