Which of the following would be a monohybrid cross?
a) aa x Aa
b) AA x aa
c) Aa x Aa
d) Aa x aa
Ans: c) Aa x Aa
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Like directional selection, sexual selection pushes phenotypes toward one extreme
a. True b. False
Nitrogen, with an atomic number of 7, has ____ electron(s) in the first energy level and ____ electrons in the second
energy level.
a. one; six b. two; five c. three; four d. four; three e. five; two
Name the four different nitrogen-containing bases that are found in DNA
What will be an ideal response?
Despite causing a life-threatening disease, the sickle-cell allele in some areas of Africa has remained in high frequency in those populations because it protects against malaria
In the United States, malaria was eradicated shortly before World War II by eliminating the mosquito that spreads the disease. What is likely to happen to the frequency of the sickle-cell allele in African Americans living in the United States? A) The frequency of the sickle-cell allele will decrease. B) The frequency of the sickle-cell allele will not change. C) The sickle-cell allele will disappear from the African American population. D) The normal allele will disappear from the African American population. E) The frequency of the sickle-cell allele will increase.