Two genes are located on the same chromosome and are known tobe 12 mu apart. An AABB individual was crossed to an aabb individualto produce AaBb offspring. The AaBb offspring were thentestcrossed to aabb individuals. What would be the predicted numbers of offspring with thefour genotypes(AaBb,Aabb, aaBb, and aabb) if the parental generation had been AAbb and aaBB instead of AABB and aabb?

Most of the feathers of erminette fowl are light colored, with an occasional black one, giving a fleckedappearance. A cross of two erminettes produced a totalof 48 progeny, consisting of 22 erminettes, 14 blacks,and 12 pure whites. What genetic basis of the erminette pattern is suggested? How would you test yourhypotheses?

One yeast strain carries the alleles lys+ and arg+, whereas another strain has lys-3 and arg-2. The two strains were crossed toeach other, and an ascus obtained from this cross has four spores with the following genotypes: lys+ arg+, lys+ arg-2, lys-3arg+, and lys-3 arg 2. This ascus has a. a parental ditype.b. a tetratype.c. a nonparental ditype.d. either a tetratype or a nonparental ditype.

A corn geneticist wants to obtain a corn plant that hasthe three dominant phenotypes: anthocyanin (A), longtassels (L), and dwarf plant (D). In her collection ofpure lines, the only lines that bear these alleles are AALL dd and aa ll DD. She also has the fully recessive lineaa ll dd. She decides to intercross the first two and testcross the resulting hybrid to obtain in the progeny aplant of the desired phenotype (which would have to beAa Ll Dd in this case). She knows that the three genesare linked in the order written, that the distance between the A/a and the L/l loci is 16 m.u., and that thedistance between the L/l and the D/d loci is 24 m.u.a. Draw a diagram of the chromosomes of the parents,the hybrid, and the tester.b. Draw a diagram of the crossover(s) necessary toproduce the desired genotype.c. What percentage of the testcross progeny will be ofthe phenotype that she needs?d. What assumptions did you make (if any)?

What is heterosis? Discuss whether it is caused by a single geneor several genes. Discuss the two major hypotheses proposedto explain heterosis. Which do you think is more likely to becorrect?

In the above group of figures, the pink lines indicate an area of a chromosome that is inverted relative to the normal (black line) order of genes. The diploid chromosome configuration of individuals 1-4 is shown in the diagram. Match the individuals with the appropriate statements (a-d). More than one diagram may correspond to each statement, and a diagram may be a correct answer for more than one question. A single crossover involving the inverted region on one chromosome and the homologous region of the other chromosome would yield an acentric fragment. Select 1 correct answer(s) 1 2 3 4

The answer is "D" but can you explain in a short summary why D is the answer please

A three-point cross was conducted, 8500 progeny were evaluated, and the genetic map was determined to be:Gene J----3mu----Gene K-----5mu-----Gene LA total of 8 double cross-over progeny were identified among the 8,500 evaluated.  What is the coefficient of coincidence?