When bone marrow stem cells are removed from the patient, infected with a virus that carries a normal gene, and returned to the patient, this is an example of
A. ex vivo gene therapy.
B. viral disinfection.
C. chemotherapy.
D. PCR.
E. in vivo gene therapy.
Answer: A
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What disease was studied in a famous pedigree analysis that included thousands of people?
a. Alzheimer’s disease b. Huntington’s disease c. cystic fibrosis d. sickle-cell anemia e. Turner’s syndrome
Individuals who have one dominant allele and one recessive allele for a trait are referred to as ________
Fill in the blank(s) with correct word
Which of the following statements best explains why dominant alleles that cause lethal disorders are less common than recessive alleles that cause lethal disorders?
A) Lethal disorders caused by dominant alleles are usually more severe than lethal disorders caused by recessive alleles. B) Unlike lethal disorders caused by recessive alleles, lethal disorders caused by dominant alleles usually cause the death of the embryo. C) Most individuals carrying a lethal dominant allele have the disorder and die before they reproduce, whereas individuals carrying a lethal recessive allele are more likely to be healthy and reproduce. D) The presence of a lethal dominant allele causes sterility.
Among vertebrate animals, urea is _____
A) made in the kidneys and immediately excreted B) added to the air in the lungs to be exhaled, along with carbon dioxide C) made in the liver by combining two ammonia molecules with one carbon dioxide D) made in the pancreas and added to the intestinal contents, along with bile salts, for excretion E) rarely the nitrogenous waste