A tall pea plant is crossed with a recessive dwarf pea plant A tall pea plant is crossed with a recessive dwarf pea plant. What will the phenotypic and genotypic ratio of offspring be a. if the tall plant was TT? b. if the tall plant was Tt? 2. A true-breeding tall, purple-flowered pea plant (TTPP) is crossed with a true-breeding dwarf, white flowered plant (ttpp). a. What is the phenotype of the F1 generation? b. What is the genotype of the F1 generation? c. What four types of gametes are formed by the F1 plants? d. Create and solve a punnett square to show the offspring of the F2 generation. d. List the phenotypes and ratios found in the F2 generation.

3. In the following cross, what is the probability of obtaining offspring that show all three dominant traits, A_B_C_ ( _ indicates that the second allele can be either dominant or recessive without affecting the phenotype determined by the first dominant allele)? AaBbcc x AabbCC a. probability of offspring that are A_B_C_ = ? b. What is the probability that the offspring of this AaBbcc x AabbCC cross will show at least two dominant traits?

5. A dominant allele M is necessary for the production of the black pigment melanin, mm individuals are white. A dominant allele B results in the deposition of the a lot of pigment in an animal’s hair, producing a black color. The genotype bb produces brown hair. Two black animals heterozygous for both genes are bred. Using MmBb x MmBb: a. List the three phenotypes and possible genotypes b. List the ratios for each of the three phenotypes. Phenotype Genotype Ratio

Linked Genes Given: b + = gray vg += normal wings b = black vg = vestigial wings Cross: (Male) b+ b vg + vg X (Female) b b vg vg Mendel’s law of independent assortment would produce which phenotypes? The actual results pg.280

6. Determine the sequence of genes along a chromosome based on the following recombination frequencies: A-B, 8 map units A-C, 28 map units A-D, 25 map units B-C, 20 map units B-D, 33 map units

7. A man with hemophilia (a recessive, sex linked condition) has a daughter of normal phenotype. She marries a man who is normal for the trait. What is the probability that a daughter of this mating will be a hemophiliac? That a son will be hemophiliac? If the couple has four sons, what is the probability that all four will be born with hemophilia?

8. Red-green colorblindness is caused by a SL recessive allele 8. Red-green colorblindness is caused by a SL recessive allele. A CB man marries a woman with normal vision whose father was CB. What is the probability of having a daughter who is also CB? What is the probability that their first son will be CB? 9. A wild-type fruit fly (heterozygous for gray body color and normal wings) is mated with a black fly with vestigial wings. The offspring have the following phenotypic distribution: wild type 778, black vestigial 785, black normal 158, gray vestigial 162. What is the recombination frequency between these genes for body color and wing size?