Which of the following is an aggregate fruit?
a. peas
b. acorns
c. pineapples
d. strawberries
e. cherries
ANSWER: d
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What would happen to the HS allele if a vaccine for malaria was 100% effective?
The human ?-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. . The HS allele would increase in frequency in populations where malaria was present. B. The HS allele would decrease in frequency in populations where malaria was present. C. There would be no change in frequency between the HS and HA allele. D. Negative frequency-dependent selection would occur and there would be a balanced frequency between the two alleles. E. The frequency of homozygous individuals would decrease and the heterozygous individuals would increase.
The lymphoid organs include all EXCEPT the
a. spleen. b. stomach. c. thymus. d. tonsils and adenoids. e. appendix.
Which property of water enables living things to survive in ponds covered with ice?
a. high heat of vaporization b. high specific heat c. degree of surface tension d. cohesion e. greatest density at 4oC
Because of the freezing temperatures of the deep ocean, all deep-sea fish must be endotherms
Indicate whether the statement is true or false