#Question id: 15283
#Unit 5. Developmental Biology
#Question id: 7271
#Unit 5. Developmental Biology
In drosophila, Head formation required higher Bicoid concentrations than thorax formation, because
#Question id: 13034
#Unit 13. Methods in Biology
#Question id: 4251
#Unit 3. Fundamental Processes
Which of the following statements correctly describes the effect a nonsense mutation would have on a gene?
#Question id: 12098
#Unit 10. Ecological Principles
The herbaceous plant Achillea lanulosa is widespread in the Northern Hemisphere. Phenotypic variation in the species has been extensively studied along an altitudinal gradient from sea level to over 3,000 meters. In California there is conspicuous variation in height; alpine plants are only several centimeters tall while those in the San Joaquin Valley may reach a height of 1.8 meters. Adaptation to different local environments also results in variation in physiological processes such as photosynthetic rate, resistance to cold, and the timing of dormancy.
The morphological variation shown by Achillea lanulosa illustrates