Sex linkage involves traits on chromosome number _____________.
a. 1
b. 7
c. 10
d. 23
Answer: d. 23
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A key feature of all viral infections is the
A. integration of viral DNA into host DNA. B. disintegration of host DNA. C. addition of a lipid membrane to the virus. D. separation of viral nucleic acid from the capsid.
A protozoan cyst differs from a helminth egg in that
A. the chromosome is free in the cytoplasm of a cyst, but enclosed in a nucleus in an egg. B. a cyst is metabolically active, but an egg is not. C. the cyst can germinate to form the organism but the egg must be fertilized. D. cysts have a uniform structure, but eggs have a wide variety of morphologies.
Explain the problems associated with the genetic disorder Tay-Sachs.
What will be an ideal response?
Which example describes mechanical reproductive isolation?
A) Two squirrel populations live on either side of a mountain range. B) Two fly species have differently shaped genitals that prevent interspecies mating. C) Two similar species of sunflowers bloom at different times of the year. D) Individuals from two wildcat species produce infertile offspring when they mate.