Describe Calvin Bridges's classic study of nondisjunction of sex chromosomes, which provided support for the chromosome theory of inheritance
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Bridges performed crosses with fruit flies, tracking the sex-linked eye-color trait. Red-eyed males were crossed with white-eyed females, yielding mostly white-eyed male offspring and red-eyed female offspring. A handful of anomalous individuals proved informative: about 1/2,000 offspring were white-eyed females or red-eyed males. Karyotypic study of these anomalous individuals revealed they had suffered nondisjunction of the sex chromosomes.
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a. pancreatic islet cells. b. the thyroid gland. c. the pituitary gland. d. the pineal gland. e. the kidneys.
What is the relationship between the wavelength of light and the quantity of energy per photon?
A) They have a direct, linear relationship. B) They are inversely related. C) They are logarithmically related. D) They are separate phenomena.
A derived character that is shared by all members of a clade is called a ______________ of that clade.
Fill in the blank(s) with the appropriate word(s).