Both members of a couple are carriers for a recessive disease allele. If the couple has four children, which of the following statements must be true?
a. One of the children has the disease.
b. Two of the children have the disease.
c. All of the male children have the disease.
d. Fifty percent of the children could be carriers of the disease.
d. Fifty percent of the children could be carriers of the disease.
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In the CRISPR / Cas system of a particular bacterial cell, it is noted that there are six spacer regions. What does this suggest about the bacterial cell?
A. The cell has six CAS genes due to past infections by viruses. B. The cell has been infected by six viruses in the past. C. The cell has developed protection from six different viruses. D. The cell has been infected by six viruses in the past and now has developed a level of protection against all of them.
Paul was an orphan found wandering a city street when he was 2 years old. At age 52, he began to experience muscle spasms and was having difficulty walking. Which of the following genetic disorders is most probable?
A) PKU B) CF C) Huntington's disease D) Marfan syndrome
Which of these carry(ies) oxygen-poor blood?
A) pulmonary arteries B) pulmonary veins C) aorta D) left ventricle
Creutzfeldt-Jakob disease is caused by a
A) bacterium. B) prion. C) virus. D) viroid. E) fungus.