Identical (monozygotic) and fraternal (dizygotic) twins provide a natural experiment for investigating the influence of genetics on traits
Outline a study approach using twins, assuming you could identify enough pairs, in which you are examining the relative contribution of genetics on blood cholesterol level.
If there is a genetic predisposition to achieving a certain blood cholesterol level, monozygotic twins might be expected to show a stronger statistical association in cholesterol level than dizygotic twins. You would need to control for environment, however: ideally, your twins should be given a controlled diet for a specified period.
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Decomposers recycle materials at ____ trophic
level(s). a. the first b. the second c. the third d. the fourth e. any of these
What is required for formation of the transcription initiation complex in eukaryotes?
A. binding of RNA polymerase II to the TATA box, followed by recruitment of transcription factors B. binding of a transcription factor to the TATA box, followed by recruitment of additional transcription factors and recruitment of RNA polymerase II C. binding of the sigma subunit to promoter elements at -35 and -10, followed by recruitment of the core polymerase D. binding of the sigma subunit to the start site followed by recruitment of RNA polymerase II E. binding of a transcription factor to the transcription bubble, followed by recruitment of additional transcription factors and recruitment of RNA polymerase III
Which of the following organisms is NOT considered a model organism?
A) a mouse, Mus Musculus B) a budding yeast, Saccaromyces cerevisiae C) a fruit fly, Drosophila melanogaster D) a human, Homo sapiens E) a bacterium, Escherichia coli
Giemsa staining of metaphase chromosomes results in a series of dark bands and light interbands. What is the basis for this difference in staining?
What will be an ideal response?