Duchenne muscular dystrophy is caused by
a. a mutation that weakens the cytoskeleton of the muscle fiber.
b. a mutation that weakens myofibrils.
c. a mutation in the X and Y chromosome.
d. a mutation that disrupts the sarcomere.
e. a mutation that increases the transmission of force.
A
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Which of the following pathogens is spread by infected lice?
A) Borrelia burgdorferi B) Plasmodium falciparum C) Rickettsia prowazekii D) Yersinia pestis
Of these 4 genotypic classes of offspring, which arose from a parental gamete produced by the F1 females? (Select all that apply.)
In Drosophila, singed bristles (sn) and cut wings (ct) are both caused by recessive, X-linked alleles. The wild type alleles (sn+ and ct+) are responsible for straight bristles and intact wings, respectively. A female homozygous for sn and ct+ is crossed to a sn+ct male. The F1 flies are interbred. The F2 males are distributed as follows:
A) sn+ ct+
B) sn ct
C) sn+ ct
D) sn ct+
Viruses are important in the study of cell biology because
A) they cause disease. B) they are the simplest form of cellular life. C) they are used as model organisms to study molecular biology and genetics. D) they cause disease and are used as model organisms to study molecular biology and genetics. E) they are the simplest form of cellular life and are used as model organisms to study molecular biology and genetics.
Hundreds of thousands of vitamin A deficiencies, and its resulting blindness, may be avoided with the
use of genetically modified ____________________. Fill in the blank(s) with the appropriate word(s).