Directions: use the information given to you below for each trait to answer the problems that follow. trait dominant form recessive form letter to use hair color brown blond b or b eye color brown blue e or e dimples dimples no dimples d or d widow’s peak widow’s peak not present w or w freckles freckles no freckles f or f handedness right handed left handed h or h 1. what is the genotype of a female who is heterozygous for eye color? 2. what is the genotype of a female who is homozygous dominant for dimples? 3. what is the genotype of a male who is homozygous recessive for hair color? 4. what is the genotype of a male who is heterozygous for the widow’s peak? 5. what is the genotype of a female who is homozygous recessive for eye color? 6. what is the genotype of a male who is heterozygous for dimples? 7. what is the genotype of a female who is homozygous dominant for handedness? 8. what is the genotype of a male who is homozygous recessive for handedness? 9. what is the genotype of a male who is heterozygous for freckles? 10. what is the genotype of a female who is homozygous dominant for hair color? 11. if a person has the genotype dd, they are considered to be? 12. if a person has the genotype hh, they are considered to be? 13. if a person has the genotype ww, they are considered to be? 14. if a person has the genotype bb, what trait are they heterozygous for? 15. if a person has the genotype ff, what trait are they homozygous for? purple flowers are dominant to white flowers: list the phenotypes of the flowers:brown eyes are dominant to blue eyes: list the phenotypes for the genotypes listed:round seeds are dominant to wrinkled seeds. list the phenotypes for the genotypes listed: rrbobtails in cats are recessive: list the phenotypes of the cats:

Experiments in environmental toxicology can sometimes be manipulative experiments in which the researcher actively chooses and manipulates the independent variable. in hunt's study, for example, dosages of bpa were manipulated and the effects were measured. in manipulative studies, the researcher controls all the other variables in the experiment, so any health effects observed in the test subjects can be attributed to differences in the independent variable. in other cases, researchers use natural experiments in which the dependent variable (typically a measure of organism health) is measured under differing contexts that are not manipulated. say, for example, that an accidental chemical spill contaminates five ponds. to determine the possible effects of the toxic chemical on frogs, a researcher could compare the hatching rate of frog eggs laid in those five ponds to the hatching rate of eggs laid in five uncontaminated ponds nearby. this would be an example of a natural experiment because concentrations of the toxic chemical in the ponds were not controlled by the experimenter, but rather resulted from the chemical spill. drag type of experiment on the left to the example of experiment on the right. blood concentrations of bpa in college students are compared to their recent manipulative consumption of canned food items 2. the feeding behavior of fish in streams that receive acidic runoff from strip mines is compared to the feeding behavior of fish in unaffected streams. the deformity rate in baby birds from nests in pesticide-sprayed fields is compared to the deformity rate in birds from nests in unsprayed fields 4 tumor development is compared in mice exposed to five dosages of a known carcinogen in the laboratory foraging activity levels are compared in tadpoles exposed to four concentrations of toxic metals in the laboratory. growth of corn plants is compared in field plots sprayed with three different dosage: s of weed killer 7 bpa concentrations in the urine of people with diabetes are compared to bpa concentrations in the urine of people without diabetes - natural; manipulative

Anne, an intern in a microbiology lab, was observing the characteristics of various specimens of protists. match each specimen to the category of protist to which it belongs.

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi