Which of the following describes the postembryonic development, called complete metamorphosis, in members of the order Diptera (flies)?
a. a single, wingless nymph instar followed by several winged adult instars
b. a series of young instars that become more and more like an adult, ending with a wingless adult instar
c. a series of nymph instars that lack functional wings, ending with an adult instar with functional wings
d. several instars of often wormlike larvae, followed by a stage where they are a sessile pupa, and then ending in an adult stage that is very different from the larval instars
Ans: d. several instars of often wormlike larvae, followed by a stage where they are a sessile pupa, and then ending in an adult stage that is very different from the larval instars
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The distinction between multifactorial and polygenic traits is that
A) polygenic traits are caused by more than one gene, and multifactorial traits are caused by one or more genes as well as environmental influences. B) multifactorial traits are not genetic, and polygenic traits are genetic. C) the genetic component can be determined for polygenic traits but not for multifactorial traits. D) polygenic traits are caused by more than one gene, and multifactorial traits are caused by only one gene.
The only cytoplasmic organelles besides nuclei that contain DNA are the ____________________. What will be an ideal response?
Upon examination, a person is found to only have half the normal number of LDL-cholesterol receptors. Which of the following best explains this?
A. pleiotropic inheritance B. incomplete dominance C. X-linked inheritance D. polygenic inheritance
Calculate the number of half-brother's grandsons Anne would have to raise to gain more indirect fitness than raising her own child.
A. 5 B. 9 C. 4 D. 8