#Question id: 5441
#Unit 8. Inheritance Biology
Two pure line of corn have mean cob length of 15 cm and 5 cm, respectively. 6 polygenes involved in this trait exhibit additive gene action. Crossing these two lines is expected to produce a progeny population with mean cob length of
#Question id: 23147
#Unit 13. Methods in Biology
#Question id: 10818
#Unit 10. Ecological Principles
Which of these relationships is generally not considered one that underlies community structure?
#Question id: 6949
#Unit 5. Developmental Biology
During gastrulation in Xenopus, the future mesoderm and endoderm move inside the embryo through the "blastopore"; in contrast, in chickens, gastrulation involves cells moving inward through the:
#Question id: 4941
#Unit 11. Evolution and Behavior
Which of the factors below weaken the hypothesis of abiotic synthesis of organic monomers in early Earthʹs atmosphere?
1. the relatively short time between intense meteor bombardment and appearance of the first life forms
2. the lack of experimental evidence that organic monomers can form by abiotic synthesis
3. Uncertainty about which gases comprised early Earthʹs atmosphere