The HbS allele that causes sickle-cell anemia
in the recessive condition is most common in
areas that experience a high frequency of
a. polio.
b. typhus.
c. diphtheria.
d. malaria.
e. cystic fibrosis
D
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If one strand of a sister chromatid from C. elegans has nine different genes, which of the
following is true about the second strand of the sister chromatid?
a. It will have the exact same genes. b. It will have the same number of genes, but this may be a different gene set. c. It may have a different number of genes. d. There is no correlation between the number of genes on either sister chromatid.
This animal has eggs with waterproofing
keratin, well-developed kidneys, internal fertilization, and is an ectotherm. This animal is
a. a snake. b. a dog. c. a toad. d. an owl. e. more than one of these.
The release of stored memory B and T cells in response to a second encounter with an antigen is called ________
A) secondary response B) innate response C) immunity D) primary response
Which example describes microevolution?
A) Birds evolved from dinosaurs. B) Lions and tigers evolved from a common cat-like ancestor. C) HIV evolved resistance to antiviral medications. D) Land plants evolved from algae.