Sex-Linked Traits

The hemophilia gene is located 12 map units from the red-green colorblindness gene on the X chromosome. Red-green colorblindness is recessive to normal colorvision. A woman with normal blood clotting and normal color vision, but whose father was a hemophiliac and whose mother was red-green colorblind, marries a man who is not a hemophiliac and is not colorblind. What percent of their children will be colorblind and have hemophilia? The answer was given. It is 3%. But I need to know how to get that answer.

Transduction

(See attached file for full problem description) --- In a generalized transduction system using P1 phage, the donor is pur+ nad+ pdx- and the recipient is pur- nad- pdx+. The donor allele pur+ is initially selected after transduction, and 50 pur+ transductants are then scored for the other alleles present. The results follow: Genotype # of colonies nad+ pdx+ 3 nad+ pdx- 10 nad- pdx+ 24 nad- pdx- 13 Total 50 a. What is the cotransduction frequency for pur and nad? b. What is the cotransduction frequency for pur and pdx? c. Which of the unselected loci is closest to pur? d. Are nad and pdx on the same side or on opposite sides of pur? Explain. (Dr... click for more

Mapping

(See attached file for full problem description) --- In a generalized transduction system using P1 phage, the donor is pur+ nad+ pdx- and the recipient is pur- nad- pdx+. The donor allele pur+ is initially selected after transduction, and 50 pur+ transductants are then scored for the other alleles present. The results follow: Genotype # of colonies nad+ pdx+ 3 nad+ pdx- 10 nad- pdx+ 24 nad- pdx- 13 Total 50 a. What is the cotransduction frequency for pur and nad? b. What is the cotransduction frequency for pur and pdx? c. Which of the unselected loci is closest to pur? d. Are nad and pdx on the same side or on opposite sides of pur? Explain. (Dr... click for more

Genetic Engineering

You are a geneticist working for a firm that specializes in plant biotechnology. Explain what specific parts (fruit, seeds, stems, roots, etc.) of the following plants you would try to alter by genetic engineering, what changes you would try to make, and why, on a) corn, b) tomatoes, c) wheat, and d) avocados. Only a few hundred of the hundreds of thousands of species in the plant kingdom have been domesticated for human use. One example is the almond. The domestic almond is nutritious and harmless, but its wild precursor can cause cyanide poisoning. The oak makes potentially nutritious seeds (acorns) that contain very bitter-tasting tannins. If we could breed the tannin out of acorns, t... click for more

Genetic Question

1.In Burmese cats, brown coat color is dominant to tan coat. Brown coat is a highly prized trait in Burmese. You have a brown male cat that you would like to offer as a stud; therefore, you need to know if it is homozygous or heterozygous for brown coat color. A. Why is this important? B.Diagram a testcross that would determine the genotype of your cat, and what the outcome would be if your cat were a homozygote or a heterozygote(genotype and phenotype). 2.Purple eyes is a dominant autosomal mutation found on chromosome 3 of drosophila. Eyeless is a recessive atosomal mutation found on chromosome 2. A true-breeding purple-eyed male is crossed with a true-breeding eyeless female (... click for more