Polyploidy is a mechanism of sympatric speciation most common to ____
a. mammals
b. birds
c. amphibians
d. plants
e. fishes
ANSWER: d
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Burning of carbon-based fuels can produce which one of the following, an odorless gas that competes with oxygen for binding to hemoglobin.
A) carbon monoxide. B) hydrogen peroxide. C) sulfuric acid. D) methane.
Answer the following statements true (T) or false (F)
1. The law of independent assortment states that the two alleles of the same gene will segregate from each other during gamete formation. 2. Offspring receive both the alleles for a given trait from one parent. 3. A locus encodes different genes in different individuals of the same species. 4. The sex of all animals is determined by chromosomes.
Concentrations of CFCs in the upper atmosphere are currently:
a. rising dramatically b. leveling off c. declining sharply d. undetectable e. rising slowly
Natural selection acts directly on the genotype of an organism
_______ Indicate whether the statement is true or false.