Why is it easy to measure allele frequencies in a codominant allele system?
A. Such systems are rare.
B. Phenotypes are equivalent to genotypes.
C. Most alleles are present in homozygous condition.
D. They are present in a 1:2:1 ratio in all populations.
E. None of these is true.
B
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Influenza pandemics occur cyclically because
A) less than 100% of the population is immunized. B) new strains emerge due to reassortment between bird, swine, and human variants. C) the vector is seasonal. D) there are environmental reservoirs that release the virus during particular seasons.
The opening to the tracheal system (respiratory system) in insects is the
A. spiracle. B. trachea. C. alveolus. D. bronchus. E. stomata.
What structures provide support to the leaf and prevent it from collapsing under its own weight?
a. palisade mesophyll and spongy mesophyll b. guard cells and the lower epidermis c. bundle sheaths and bundle sheath extensions d. cuticle and the upper epidermis e. trichomes and stipule
The structure labeled 2 in Figure 51-1 is the:a
endoderm layer. b. mesoderm layer. c. blastopore. d. blastocoel. e. archenteron