Uracil will pair with
a. ribose.
b. adenine.
c. cytosine.
d. thymine.
e. guanine
B
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Many male birds will expend a great deal of energy building nests. Females will mate with the males who build the
best nests. This is best described as an example of ____.
a. natural selection b. sexual selection c. runaway selection d. an invasive species e. disruptive selection
According to the _____, modern humans originated in, and migrated out of, East Africa
a. haplotype data of mitochondrial DNA sequences b. haplotype data of Y chromosome sequences c. out-of-Africa model d. multiregional model e. fossil record
The same genetic condition that causes sickle-cell anemia can also protect against:
A. HIV. B. hemophilia. C. malaria. D. cholera.
An individual described as heterozygous has a _____.
A) pair of identical dominant alleles B) pair of nonidentical alleles C) pair of identical recessive alleles D) phenotype that clearly indicates the genotype