A genetic change that caused a certain Hox gene to be expressed along the tip of a vertebrate limb bud instead of farther back helped make possible the evolution of the tetrapod limb. This type of change is illustrative of _____
A) the influence of environment on development
B) paedomorphosis
C) a change in a developmental gene or its regulation that altered the spatial organization of body parts
D) heterochrony
C
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Refer to the accompanying figure. Recall that eggs from the same female were exposed to each of the eight treatments used. This aspect of the experimental design tested which of the following hypotheses?
A) The longer day lengths of summer trigger the development of twig-like caterpillars. B) Differences in air pressure, due to elevation, trigger the development of different types of caterpillars. C) Differences in diet trigger the development of different types of caterpillars. D) The differences are genetic. A female will either produce all flowerlike caterpillars or all twig-like caterpillars.
Mud is composed of:
a. dirt and water. b. iron and diatoms. c. clay and silt. d. calcareous and siliceous ooze. e. sand and clay.
Four of the following animals form eusocial groups. Which one is the exception?
A. Termites B. Mole rats C. Wolf pack D. Honey bees E. Ants
What is the transcription product of the sequence GCTAGCGATGAC?
A) CGTUCGCUTCUG B) CGAUCGCUACUG C) CAGTAGCGATCG D) CGUTCGCUTCUG