The ABO blood groups in humans are determined by a multiple allelic system in which IA and IB are codominant and are dominant to iO. If an infant born to a mother with blood type O is also type O, the father's blood type is:
A: O or A.
B: A or B.
C: O.
D: O, A, or B.
E: impossible to determine.
Answer: D: O, A, or B.
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A. Retrotransposons B. Insertion sequences C. Composite transposons D. Conjugal transposons
Which of the following organisms lack a hydrostatic skeleton?
A. planarian B. roundworms C. hydra D. earthworms E. cicada
Evidence that parthenogenic whiptail lizards are derived from sexually reproducing ancestors includes _____
A) the requirement for male-like behaviors in some females before their partners will ovulate B) the development and then regression of testes prior to sexual maturation C) the observation that all of the offspring are haploid D) the persistence of a vestigial penis among some of the females
A nursing student develops a positive reaction to the tuberculin skin test. A history reveals possible exposure to patients with tuberculosis. A sputum sample is acid-fast negative. When asked for vaccination records, the student reports that childhood
vaccination records were lost when the family emigrated from a Southeast Asian country. What is the best explanation for the test results? A) The student has been infected with Mycobacterium tuberculosis. B) The student has been exposed to Mycobacterium tuberculosis. C) The student is not infected. D) The student has been exposed to Mycobacterium tuberculosis or was vaccinated with BCG vaccine. E) No conclusion is possible with the information provided.