Which variation could be subject to natural selection?
A) A dog with short legs due to malnutrition is able to crawl into holes better than his littermates.
B) A tree is not infested by a ground-dwelling beetle when the homeowner cuts the lower branches.
C) A hyena is born with a spotted fur pattern that allows it to hide in the grass better than its littermates.
D) A pigeon learns that when its keeper comes near it will get fed.
C
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When one oxygen atom shares two pairs of electrons with another oxygen atom, O2 is formed via a(n)
A. single covalent bond. B. double covalent bond. C. triple covalent bond. D. ionic bond. E. hydrogen bond.
Which genes are responsible for your overall structure, such as how many legs you have and where they develop?
A. Homeotic genes B. Growth factor genes C. Proto-oncogenes D. Oncogenes
Tay-Sachs, which is a recessive lethal disease, results only when individuals possess two copies of the disease-causing allele. Which of the following statements is true about this disease?
a) Heterozygous individuals are more fit than homozygous dominant individuals, so eventually, there will only be heterozygotes in the population. b) Heterozygous individuals may pass on their copy of the disease-causing allele to offspring. c) All cases of this disease must be caused by new mutations. d) Heterozygous individuals only pass on the dominant copy of the allele to offspring. e) A homozygous individual can pass on both of the recessive genes for Tay-Sachs.
What is predicted to be the increase in the Earth's temperature by the end of the century?
A. 1.1-6.4 degrees Fahrenheit B. 8.0-13.5 degrees Fahrenheit C. 4.0-10.5 degrees Fahrenheit D. 2.0-11.5 degrees Fahrenheit