The vertebrate central nervous system consists of a brain and _________.
Fill in the blank(s) with the appropriate word(s).
Answer: spinal cord
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What type of antibody is produced first after the initial exposure to antigen?
A. IgD B. IgM C. IgE D. IgA E. IgG
Squirrels in cities are accustomed to humans and will continue to forage in their presence. What term best describes this behavior?
a. learned behavior b. imprinting c. desensitization d. habituation e. habit formation
Tall (D) is dominant to dwarf (d). Give the F2
genotypic and phenotypic ratios of a cross between a pure-breeding tall plant and a pure-breeding dwarf plant. What will be an ideal response?
An unscrupulous dog breeder has been selecting for dogs that have very large litters, with the goal of maximizing profits. Why might this strategy be counterproductive?
A. Litter size is not influenced by genetics. B. Intrauterine cannibalism will reduce the number of puppies. C. The puppies from large litters are likely to be malnourished, and the mother will have few resources to devote to future litters. D. It will cost too much money to feed all those puppies.