On human chromosome 11 there is a gene called DRD4. This gene carries the instructions for building a protein that is receptor for the brain chemical dopamine. There are two different alleles, C and T. Subjects in a study (with known DRD4 genotypes) responded to a questionnaire on temperament and character. Based on the graph shown above, what conclusion might you draw about an individual with two C alleles?
What will be an ideal response?
they would be more likely to exhibit novelty-seeking traits
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Evidence that differentiating cells all contain complete genomes of an organism is provided by
a. comparison of frog and sea urchin development. b. Some cells remain totipontent c. totipotent cells give rise to multipotent cells d. multipotent cells can give rise to pluripotent cells e. the successful cloning of a sheep - Dolly
In adaptive immune responses, which of the
following is NOT capable of acting as an antigen-presenting cell?
a. T cell b. macrophage c. dendritic cell d. B cell e. all of these are capable
Smell and taste receptors would be classified as ____
a. photoreceptors b. chemoreceptors c. mechanoreceptors d. thermoreceptors e. nociceptors
The front limbs of birds and bats -- both wings -- are considered to be:
a. homologous structures. b. homozygous structures. c. divergent structures. d. vestigial structures. e. homoplastic structures.