Fruit flies with the genotypes Xg+h+Xgh and XghY are crossed. Note that two X-linked loci are being evaluated, and the presence of a + indicates a dominant allele. The homogametic offspring will.... 1. express either the dominant or the recessive phenotypes for both g and h. 2. all express both dominant phenotypes. 3. express neither phenotype. 4. all express both recessive phenotypes

Fruit flies with the genotypes XghXgh and Xg+h+Y are crossed. Note that two X-linked loci are being evaluated, and the presence of a + indicates a dominant allele. The heterogametic offspring will... 1.all express a dominant g phenotype and recessive h phenotype. 2. all express both dominant phenotypes. 3. all express both recessive phenotypes. 4. all express a recessive g phenotype and a dominant h phenotype.

7) In cats, the gene for coat color is both X-linked and incompletely dominant. There are black coat and yellow coat alleles, with calico (tortoise shell) as the heterozygous form. If a yellow male mates with a calico female, what are the expected offspring phenotypes (in percent)? hbit

1. Two loci found in mice are suspected to be linked. To test this hypothesis, a group of graduate students performed a test cross between mice that are true breeding for both dominant traits and mice that are true breeding for both recessive traits. Individuals from the F1 generation were crossed with individuals that express both recessive traits. The phenotypic results are shown in the table below. Use chi-square analysis to determine if the graduate students’ hypothesis is supported by the evidence. Phenotype Number of OffspringDominant 1, Recessive 2 132Dominant 1, Dominant 2 128Recessive 1, Recessive 2 118Recessive 1, Dominant 2 124 a. What are the degrees of freedom and the critical chi-square value (from the table)?b. What is the calculated chi-square value?c. Do the results support that the loci are linked or that they are independently assorted (unlinked)?

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1. In mice, black fur (B) is dominant over brown fur (b). Breeding a brown mouse and a homozygous black mouse produces all black offspring. a. What is the genotype of the gametes produced by the brown-furred parent? b. What genotype is the brown-furred parent? . c. What genotype is the black-furred parent? . d. What genotype is the black-furred offspring?. e. If two F, mice are bred with one another, what phenotype will the F, offspring be, and in what proportion? phenotype. proportion.

|| IV V Examine the pedigree and determine which of the following modes of inheritance best explains this trait: A. Autosomal dominant B. Autosomal recessive C. X-linked dominant D. X-linked recessive E. Y-linked F. Mitochrondrial A. Explain why the trait is best described by the mode of inheritance you conclude. B. Using your hypothesis, determine the genotypes of the pair in generation I and the members of generation V. Explain and justify your answers

7. In the guinea pig, one locus involved in the control of coat color may be occupied by any of four alleles: C (full color), ck (sepia), cd (cream), or c (albino), with an order of dominance of: C>ck > cd > c. In the following crosses, determine the parental genotypes and predict the phenotypic ratios that would result. a) Sepia x cream, where both guinea pigs had an albino parent b) Sepia x cream, where the sepia guinea pig had an albino parent and the cream guinea pig had two sepia parents c) Sepia x cream, where the sepia guinea pig had two full color parents and the cream guinea pig had two sepia parents d) Sepia x cream, where the sepia guinea pig had a full color parent and an albino parent and the cream guinea pig had two full color parents.