Which of the following were the first vertebrates to appear on land?
A. amphibians
B. non-avian reptiles
C. birds
D. mammals
E. fish
Answer: A. amphibians
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There are three alleles controlling the ABO blood types. IA and IB are codominant genes so that the
combination IAIB produces the AB blood type. The third allele, IO, is recessive to the other two alleles. Indicate which of these parents could produce the given child:Parents Child Yes or No (a) A ? AB B (b) A ? O A (c) A ? B O (d) A ? AB O (e) A ? AB B (f) B ? B O Observing Patterns in Inherited Traits 115 (g) AB ? AB A What will be an ideal response?
If the frequency of a recessive allele is 36 percent,
the frequency of the dominant allele is what percent? a. 5 b. 8 c. 25 d. 48 e. 64
Which structure of the virus in the accompanying figure is the capsid?
a. 1
b. 2
c. 3
d. 4
e. 5
Forests along rivers in the Pacific Northwest that have lost their salmon populations are less productive because the
A) pollution that killed the fish has also directly affected the trees. B) global warming that wiped out the fish has also harmed the trees. C) dams that prevented the fish from migrating also flooded the forests. D) nitrogen the fish brought from the ocean and contained in their tissues has been lost. E) fishers who overharvested the salmon compacted the soil in the process.