At the "bl" locus (=gene), the wild phenotype has a light colored body, while the mutant has a dark colored body. At the "br" locus, the wild phenotype has red eyes while the mutant phenotype has brown eyes. You have performed a dihybrid cross (P = bl/bl, br/br x bl+/bl+, br+/br+). Therefore, the F1 consists entirely of individuals with the bl/bl+, br/br+ phenotype. a. Using a branch diagram, show the expected genotype frequencies for the F2 (a cross between F1 individuals). CS Scanned with CamScanner

You perform a cross between a parent with the genotype WWiiNNttEErr and another parent that is wlnnTTeerr. All genes are unlinked except for W and I which are 22 mu apart. You take an F1 from this cross and cross it with an individual that is wwiiNntteerr. a) What is the probability that this final cross yields an offspring that is wwiinntteerr? b) What is the probability that this final cross yields an offspring that is NNT or Nntt. (You can ignore all of the other genes for this question.)

The trihybrid e+f+g+/efg is test crossed to the triple recessive efg/efg and the following genotypes were obtained in the progeny: efg = 2; efg = 28; e'fg* = 9; e*rg 32; efg 73; e*fg* = 10; ef g* =10; e'fg 2; %3D "The odd gene is The gene order is The gene distance between e-f is The gene distance between f-g is The gene distance between e-g is

The pedigree below shows the phenotypes of the ABO blood groups and Rhesus factors [positive (+) and negative (-)] for several members of a family. I (B+ AB- 1 2 3 4 II O- A+ В- B- AB+ A+ 1 2 4 5 6 a. What are the ABO blood group genotypes of individuals I-1 and I-2? b. Which child/ren of individual I-4 can donate blood to him? c. Which individual in the pedigree can donate blood to all the other individuals in the pedigree?

Suppose that red flower color (RR or Rr) is dominant to white flower color (rr) in a petunia. A friend has a petunia plant with red flowers and wants to determine whether the plant is RR or Rr. A) What cross could you perform to help your friend determine the genotype of his petunia plant? B) How will this cross help you determine the genotype of your friend's red- flowered petunia? That is, how will the results from this cross differ if the red-flowered petunia is RR versus Rr?

A series of crosses were performed between pure breeding lines of mice with different coat colours. a) Based on the results of the crosses, describe the type of gene interaction that gives the white phenotype. Explain your reasoning.  b)  Determine the order of the function.

The wild-type (W) Abraxas moth has large spots on its wings, but the lacticolor (L) form of this species has very small spots. Crosses were made between strains differing in this character, with the following results:Provide a clear genetic explanation of the results in these two crosses, showing the genotypes of all individual moths.

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

Gene “A” and gene “B” are not linked. Each has two alleles. The A allele is dominant over the a allele and the B allele is dominant over the b allele. Answer the following questions about a dihybrid (two-trait) cross. A) List all of the possible gametes (eggs) that could be produced by an individual with the genotype: aabb B) List all of the possible gametes (sperm) that could be produced by an individual with the genotype: AaBB C) Fill out a Punnett square for the dihybrid cross cross between the two individuals listed above (aabb x AaBB). What percent of the offspring from this cross would have the dominant phenotype for both traits?

You are working with a dog breeder to produce a litter of puppies from their dogs. Of particular interest to this breeder is the texture of the coat and the presence of spots. The texture of the coat is controlled by one gene (R = rough coat, r = smooth coat), and the presence of spots is controlled by a separate gene (S = spots, s = solid coat). The breeder decides to perform the following cross: RrSs x rrSs What percentage of the offspring would you expect to have the following phenotypes: Rough and spotted: Incorrect answer: 56.25% Rough and solid: Incorrect answer: 18.75% Smooth and spotted: Incorrect answer: 18.75% Smooth and solid: Incorrect answer: 6.25%