A population of 1,000 birds exists on a small Pacific island. Some of the birds are yellow, a trait determined by a recessive allele. The others are green, a characteristic determined by a dominant allele. A hurricane on the island kills most of the birds from this population. Only ten remain, and those birds all have yellow feathers. Which of the following statements is true?
A) Assuming that no new birds come to the island and no mutations occur, future generations of this population will contain both green and yellow birds.
B) The hurricane has caused a population bottleneck and a loss of genetic diversity.
C) This situation illustrates the principle of adaptive radiation.
D) This situation illustrates the effect of a mutation event.
E) The ten remaining birds will mate only with each other, and this will contribute to gene flow in the population.
Ans: B) The hurricane has caused a population bottleneck and a loss of genetic diversity.
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Which of the following statements best describes the differences between snakes and lizards?
A. All snakes lack eyelids and all lizards have eyelids. B. All snakes lack external ear openings and all lizards have external ear openings. C. Some snakes are venomous and no lizards are. D. All snakes lack limbs but all lizards have limbs. E. None of the other choices are foolproof and combinations of characteristics are sometimes necessary to distinguish lizards and snakes.
A mutation in the DNA of C. elegans means ____________________
a. there may be a change in a single nitrogenous base b. there may be a change in the type of sugar in the backbone of DNA c. it will code for a different lipid molecule d. it will have a different start codon
Transcription is terminated in prokaryotes by ____
a. generation of a stop codon b. transcription of an mRNA terminator sequence c. splicing introns out and pasting exons together d. generation of a guanine cap e. generation of a poly-A tail
Which is not a nucleotide base in DNA?
a. adenine d. thymine b. guanine e. cytosine c. uracil f. All are in DNA.