Why doesn't inbreeding depression, by itself, cause evolution?
A) It decreases the population's average fitness.
B) It limits gene flow.
C) It does not change the population's allele frequencies.
D) It increases homozygosity.
E) It violates the Hardy-Weinberg assumptions.
Answer: C
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A purine or pyrimidine that is attached to a sugar, either ribose or deoxyribose, is called a ________.
A. nucleic acid B. nucleotide C. nucleoside D. nitrogenous base
Cancer can be caused by mutations. Genetic analysis of Anna Karenena's tumor shows that the cell proliferation was triggered by a somatic mutation in the MYC gene, causing this gene to be inappropriately activated
Anna is concerned about passing this cancer on to the children she plans to have in the future. Should this be a concern? A. Yes, she should worry because tumor growth was triggered by a genetic change and mutations are passed on through cell divisions. B. No, this is not something to worry about because mutations in cancer cells cannot be passed on in cell division. C. No, she should not worry about her children because this did not occur in a germline cell.
The Lac repressor:
A. binds to the Lac promoter. B. only binds specifically to DNA. C. functions as a dimer. D. functions as a tetramer. E. prevents bending of DNA.
Which of the following have no nuclei?
a. platelets b. leukocytes c. erythrocytes d. platelets and erythrocytes e. leukocytes and erythrocytes