For linkage analysis, a test cross is used rather than a hybrid cross. Why is this essential? Why would a hybrid cross result in incorrect estimates of genetic distance?

what is Unequal crossing-over between duplications ?

What is the genotype of the F1 generation of the corn monohybrid cross described above? What is the phenotype of the F1 generation of the corn monohybrid cross described above? What are the possible maternal and paternal genotypes of the F1 gametes of the corn monohybrid cross described above? What is the genotype of the parents of the corn dihybrid cross described above? What are the phenotypes of the parents of the corn dihybrid cross described above? What are the possible genotypes of the parent gametes of the corn dihybrid cross described above? What is the genotype of the F1 generation of the corn dihybrid cross described above? What is the phenotype of the F1 generation of the corn dihybrid cross described above? What are the possible maternal and paternal genotypes of the F1 gametes of the corn dihybrid cross described above?

If genes A and B are linked, how would you figure out what would be the expected percentages of nonrecombinant and recombinant progeny in a test cross of AaBb heterozygotes?

What is the relationship between recombination frequency and a centiMorgan?

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.

If a recombination frequency cannot be above 50%, what does it mean if two genes are, say, 60 mu apart? Does that mean they technically independently assort, there is just some sort of overestimation? Or that the two genes actually have another gene in between?

You have a garden and some pea plants have dark leaves and others have striped leaves. You conduct a series of crosses (1 through 5) and obtain the results given in the table. What is the genotype of the parents in cross 1? A) Aa x aaB) Aa x AaC) aa x aaD) AA x aa

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?