Cystic fibrosis is a recessive disorder. If a couple, each of whom is heterozygous for the CFTR mutation, have

children, what is the probability that they will have a child with cystic fibrosis?



a. 0%
b. 25%
c. 50%
d. 75%
e. 100%


ANSWER: b

Biology & Microbiology

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Answer the following statements true (T) or false (F)

1. The development of hypertension in humans is associated with obesity, smoking, age, and kidney disease. 2. In an open circulatory system, there is no difference between blood and interstitial fluid. 3. Relative to closed circulatory systems, Open Circulatory Systems pump hemolymph at relatively high pressure. 4. Blood is typically delivered to respiratory structures at low pressures in closed circulatory systems.

Biology & Microbiology

Questions about ultimate causes for behavior are _____ questions, while proximate questions about behavior are _____ questions.

a. what; who b. why; how c. what; how d. how; why e. complicated; simple

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The membranous labyrinth of the inner ear consists of the:a

saccule, utricle, and three semicircular canals.

b. vestibular canal and oval window. c. cochlea, tympanum, and three bones. d. statoliths and hair cells. e. endolymph, perilymph, and the organ of Corti.

Biology & Microbiology

The purpose of the pulmonary circuit is to ________ .

a. deliver blood to the hepatic portal system b. send de-oxygenated blood to the heart c. circulate oxygenated blood to the tissues d. oxygenate blood received from the tissues e. receive oxygenated blood from the heart

Biology & Microbiology