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- Individuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these loci linked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?For a given cross, the expected number of double recombinants is 18 and the observed number of double recombinants is 12. What is the coefficient of coincidence (COC)? What is the interference (I)?What will be the PR and GR of the following crosses? Give also their phenotypes. (Designate your own phenotype for each character) AaBb x aabb AAbb x AaBB AaBb x aaBB AABb x aabb
- In a cross between mice the genotypes AB/ab x ab/ab, what is the recombination frequency if the progeny numbers are 72 AB/ab, 68 ab/ab, 17 Ab/ab, and 21 aB/ab? The alleles are shown for each chromosome, separated by a slash (/)in a cross AaBb X aabb, the following progeny were obtained: AaBb=50 aabb=46 Aabb=7 aaBb=6 What is the recombination frequency between the genes A and B? How far apart are they if they were on the same chromosomea phenotype aB from an Aabb x aaBb cross? an ab gamete from an aaBB individual?
- 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?Using the Dihybrid Cross, Give the Total Number and Types of Gametes formed of MmNnOoPPQQRrssTtQq. Show all the gametes that are formed by the following genotypes.What is the predicted phenotypic outcome of a dihybrid cross and a dihybrid text cross? Why?
- The genotype of EB27 and EB67 are unknown. Based on pedigree, what are the most likely genotype of each individual?In the self of a polygenic trihybrid R1/r1 ; R2/r2 ; R3/r3,use the product and sum rules to calculate the proportion of progeny with just one polygene “dose.”What two essential criteria must be met in order to execute a successful mapping cross?
