A man and woman are each heterozygous for the autosomal recessive disorder cystic fibrosis. If they
want to have three children, what is the probability that only one of the children will have cystic
fibrosis?
a. 1/4
b. 3/4
c. 9/16
d. 9/64
e. 27/64
D
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Timber wolf populations are partially controlled by wolf behavior. For example, wolves form packs and are territorial. Therefore, only a finite number of wolves will comprise a pack and occupy a relatively large territory. Which of the following best describes this type of population-regulating mechanism?
a. competitive exclusion mechanism b. niche-controlling mechanism c. habitat-controlling mechanism d. extrinsic mechanism e. intrinsic mechanism
The atrioventricular node functions as the cardiac pacemaker.
a. true b. false
What experimental results would indicate that the mutation lacIs is dominant to lacI+?
What will be an ideal response?
From earliest to latest, the overall sequence of early development proceeds as follows:
A) gastrulation ? organogenesis ? cleavage B) ovulation ? gastrulation ? fertilization C) cleavage ? gastrulation ? organogenesis D) gastrulation ? blastulation ? neurulation E) preformation ? morphogenesis ? neurulation