What best explains the occurrence of identical plant fossils in South Africa, Antarctica, and South America?
a. Severe storms spread seeds from one continent to the other two
b. All three land masses were at one time connected, but have since drifted apart.
c. Migrating birds carried the seeds from one location to another, establishing new populations.
d. All three continents experienced identical climates.
b
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Chemical bonds are based on attractions
between the ____ of two atoms.
a. electrons and protons b. protons c. protons and neutrons d. electrons e. neutrons
Water flows over gills in the opposite direction of blood flow in a process known as
A) inhalation. B) respiration. C) diffusion. D) countercurrent exchange.
Which of the following statements regarding mitosis and meiosis is false?
A) Mitosis provides for growth and tissue repair. B) Meiosis provides for asexual reproduction. C) In mitosis, the chromosomes replicate only once in the preceding interphase. D) All the events unique to meiosis occur during meiosis I.
In recessive lethal diseases such as Tay-Sachs disease, carriers have one copy of the normal allele and one copy of the allele for the disease. Carriers are represented in the Hardy-Weinberg formula by ________.
A. 2pq B. 1 - q C. the Hardy-Weinberg equilibrium D. the frequency of homozygous dominants plus frequency of heterzygotes plus the frequency of homozygous recessives