The letter "D" in the accompanying figure represents which teeth?
a. incisors
b. molars
c. canines
d. premolars
e. grinders
ANSWER: a
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Inversions occur when a portion of a chromosome is ________
a. relocated on a different chromosome b. lost c. repeated two or more times d. oriented in a reversed direction
Which of the following is false regarding
morphogens? a. They are long-range signals in pattern formation. b. They are encoded by master genes c. They affect gene expression d. Their concentration increases with distance from source. e. All of these are true.
If, in a heterozygous individual, only one allele is expressed in the phenotype, that allele is
A) normal. B) haploid. C) recessive. D) potent. E) dominant.
Which of the following does not occur during early cleavage of a frog zygote?
A) The developing cell undergoes mitosis. B) The nuclear-to-cytoplasmic ratio of the two resulting cells increases. C) The ratio of surface area to volume of the two resulting cells increases. D) The embryo grows significantly in mass. E) The developing cell undergoes cytokinesis.