Solved by a verified expert:MBG*2040 Genetics Assignment #3Name: _________________________________________ ID#_____________Tutorial Day and Time:____________________________________________TA name:1. Recall that Mendel examined a gene that controlled the texture of the peaseed (alleles W and w) and a gene that controlled the colour of the seed (allelesG and g). Mendel determined that these genes were independently assorting.a) Imagine that gene G is on chromosome 1 and gene W is on chromosome 3,what phenotypic ratio (show all phenotypes) would be expected when a dihybridis test-crossed? Show your work.b) Imagine that genes G and W are 30 map units apart on chromosome 3, whatphenotypic ratio (show all phenotypes) would be expected when a dihybrid istest-crossed? Assume the alleles are in cis configuration in the dihybrid. Showyour work.c) Imagine that genes G and W are tightly linked on chromosome 3, whatphenotypic ratio (show all phenotypes) would be expected when a dihybrid istest-crossed? Assume the alleles are in trans configuration in the dihybrid. Showyour work.MBG*2040 Fall 2012 Assignment #3 Page 1 of 6 Name: _________________________________________ ID#_____________d) Imagine that genes G and W are 80 map units apart on chromosome 3, whatphenotypic ratio (show all phenotypes) would be expected when a dihybrid istest-crossed? Show your work.2. In rabbits, solid-coloured coats (S) is dominant to white-spotted coats (s) andshort hair (L) is dominant to long hair (l). Imagine that gene S is linked to gene Land they are 12.5 map units apart. True-breeding solid-coloured, short-hairedrabbits are crossed to true-breeding white-spotted, long-haired rabbits.a) What is the genotype of the F1 rabbits? The genotypes must show linkage.b) The F1 offspring are test-crossed. What percentage of the test-cross progenywill have white spots and short hair? Show your calculations.c) The F1 offspring are intercrossed. What percentage of offspring will bedihybrids? Show your calculationsMBG*2040 Fall 2012 Assignment #3 Page 2 of 6 Name: _________________________________________ ID#_____________3. Imagine the genes for red-green colourblindess and haemophilia are 30 mapunits apart on the X chromosome. Examine the pedigree below. The lettersbelow the symbols tell you if the individuals is affected with haemophilia (h) orcolourblindness (cb) or both (cb+h).normalcbcbcb+hhnormalhnormalnormalcba) Number the generations and individuals in this pedigree.b) Write genotypes (and their probabilities) for all individuals in the pedigree.Make sure your genotypes are written to show linkage.c) List the gametes and their proportions that can be produced by II-2.MBG*2040 Fall 2012 Assignment #3 Page 3 of 6 Name: _________________________________________ ID#_____________d) What is the probability that the next child of II-2 will be a son withcolourblindness and normal blood clotting? Show your work.e) List the gametes and their proportions that can be produced by III-4.f) Question will be given in tutorial.g) Question will be given in tutorialMBG*2040 Fall 2012 Assignment #3 Page 4 of 6 Name: _________________________________________ ID#_____________4. Nail-Patella Syndrome is caused by a rare dominant allele, N. This locus is 20map units from the ABO blood type locus. The pedigree below shows theinheritance of these two traits. Shaded individuals are affected with Nail-PatellaSyndrome.AOABABABa) Number the generations and individuals in this pedigree.b) Write genotypes (and their probabilities) for all individuals in the pedigree.Make sure your genotypes are written to show linkage.c) List the gametes and their proportions that can be produced by II-1 and II-2.MBG*2040 Fall 2012 Assignment #3 Page 5 of 6 Name: _________________________________________ ID#_____________d) What is the probability that the first child of II-1 and II-2 will have Type ABblood and Nail-Patella Syndrome? Show your work.e) What is the probability that the first child of II-1 and II-2 will have Type O bloodand be phenotypically normal? Show your work.f) The first child of II-1 and II-2 is born and the baby has Type B blood. What isthe probability that this baby also has Nail-Patella Syndrome? Show your work.MBG*2040 Fall 2012 Assignment #3 Page 6 of 6