When Mendel performed a dihybrid cross of plants heterozygous for seed color and seed shape, he saw a 9:3:3:1 ratio in the next generation. Explain what this ratio describes and what each number represents
What will be an ideal response?
It is the ratio of offspring with the following: both dominant phenotypes; dominant color phenotype and recessive shape phenotype; recessive color phenotype and dominant shape; both recessive phenotypes.
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Actinomycetes produce many of the antibiotics we use in medicine.
Answer the following statement true (T) or false (F)
Multiple models were proposed to explain replication. What experimental approach allowed researchers to distinguish between them?
A. Cells were pulsed with high specific activity [3H] thymidine to show the direction of DNA synthesis on the chromosome. B. Cells infected with T4 bacteriophage were grown in the presence of radioactive nucleotides. When DNA was analyzed in alkaline CsCl gradients, the presence of short DNA fragments indicated that discontinuous replication had occurred. C. Bacteria were grown on 15NH4 until the entire DNA contained heavy nitrogen and then the cells were transferred to normal, light media for one round of replication. The resulting DNA molecules were separated in density gradients and compared to the expected results for each proposed model. D. Bacteria were grown on [3H] thymidine until the entire DNA contained heavy thymidine and then the cells were transferred to normal, light media for one round of replication. The resulting DNA molecules were separated in density gradients and compared to the expected results for each proposed model. E. None of these choices is correct.
The hormone that is antagonistic in action to glucagon is
a. norepinephrine. b. insulin. c. thyroxine. d. epinephrine. e. mineralocorticoids.
Which group includes all of the other groups?
A. Domain B. Order C. Family D. Genus E. Species