1. The mutant strain maroon-like has an X-linked mutant allele (X") that results in deep maroon-colored eyed in homozygous females and hemizygous males. To prove to a skeptical friend that this trait is in fact X-linked you set up a reciprocal cross against the wild type. What are the expected genotypic and phenotypic frequencies of each half of this crossing experiment? 2. What is the significance of reciprocal crossing?

6. please answer this

8. In guinea pigs, the allele for black fur (B) is dominant over the allele for white fur (b). Similarly, the allele for straight hair (H) is dominant over the allele for having rough hair (h). Pure breeding rough haired guinea pigs with black fur were crossed with pure breeding straight haired guinea pigs with white fur. a. State the genotype and the phenotype of the F1 individuals produced as a result of this cross.b. Two F1 offspring were mated together. Calculate the expected ratio of phenotypes in the F2 generation.c. Show the completed Punnett square below.

12) You are studying two flies that you found in your lab one has bristly hair the other has dumpy wings. You cross these two mutants together and all the resultant flies are wild type. You then cross these animals to a double mutant and collect the following offspring. Phenotype Observed Normal 92 Bristly Hair 122 Dumpy Wings 129 Bristly Hair and Dumpy Wings 97 Which are your dominant alleles? Check all that apply O Bristly Hair O Normal Wings O Dumpy Wings O Normal hair 13) Assuming that these traits are sorting in a Mendelian way, and given that you collected 440 flies from your cross, how many flies do you expect that have just bristly hair _(1). ;bristly hair and dumpy wings_(2). 1) 2) 14) Given the numbers you just calculated for expected and the observed listed earlier, what is the chi-squared value for this cross? Numerical answer

1.What are the possible genotypes of the parent gametes of the corn dihybrid cross described above? 2.What is the genotype of the F1 generation of the corn dihybrid cross described above? 3.What is the phenotype of the F1 generation of the corn dihybrid cross described above? 4.What are the possible maternal and paternal genotypes of the F1 gametes of the corn dihybrid cross described above?

4. You have determined that the gene order for three linked genes being studied is A B C. The number of recombinants resulting from crossover between genes A and BC are 44 and 48, respectively, while the double-crossover progeny total 4 and 6. What is the recombination frequency between genes A and B if the total progeny from the cross is 1000? Show all of your work.

5. A cross between two wild-type flies gave progeny all of which were wild type. When vg e they were test crossed to flies the following results were obtained: vg e (a) 4 of the test crosses gave wild type, vestigal ebony, vestigal and ebony in a 1:1:1:1 ratio. (b) 4 of the test crosses gave all wild type. (c) 4 of the test crosses gave vestigal and wild type in a 1:1 ratio. (d) 4 of the test crosses gave ebony and wild type in a 1:1 ratio. What are the genotypes of the original pair of wild-type flies?

1.What are the phenotypes of the parents of the corn dihybrid cross described above? 2. What are the possible genotypes of the parent gametes of the corn dihybrid cross described above? 3.What is the phenotype of the F1 generation of the corn dihybrid cross described above?

1. It's a very well known fact that most dragons do not breathe fire, and it's also well known that alleles that enable fire breathing are recessive to the wild-type Sweet Breath phenotype. However, it's unclear how many different genes when mutated cause the fire breathing phenotype. To answer this question you use four different strains of dragon and perform a series of crosses. Your strains are the Hungarian Horntail (Strain A), the Norwegian Ridgeback (Strain B), the Romanian Longhorn (Strain C), and the Swedish Shortsnout (Strain D). All strains are true breeding for a single homozygous recessive mutation that allows them to breathe fire. Cross #1 Hungarian Horntail (A) X Norwegian Ridgeback (B) = F1: All Sweet Breath Cross #2 Romanian Longhorn (C) X Swedish Shortsnout (D) = F1: All Sweet Breath Cross #3 Swedish Shortsnout (D) X Norwegian Ridgeback (B) = F1: All Firebreathing Cross #4 Romanian Longhorn (C) X Hungarian Horntail (A) = F1: All Firebreathing How many genes are…

11. Shown below are the offspring of the testcross qr/q +r+ X q r/q r. Which groups are in the recombinant class?   q+r and qr+   q+r+ and qr+   qr and qr+   q+r+ and qr