#Question id: 3325
#Unit 11. Evolution and Behavior
The frequency of the dominant red allele (R) in a population of diploid organisms is equal to the frequency of the recessive white allele (r). The frequency of red individuals assuming Hardy-Weinberg equilibrium is (express the frequency using decimal notation, not as a fraction or a percentage)
#Question id: 34128
#Unit 7. System Physiology – Animal
#Question id: 28231
#Unit 5. Developmental Biology
which of the following stem cells play major roles in organisms Such as hydra, axolotl, and zebrafish with high regenerative capabilities?
#Question id: 7187
#Unit 5. Developmental Biology
Following statements regarding to feedback loops during limb development.
A. When the limb bud is relatively small, an initial positive feedback loop is established between Fgf10 produced in the mesoderm and Fgf8 produced in the ectoderm, promoting limb outgrowth.
B. As the limb bud grows, the ZPA is established, and another regulatory loop is created by inhibiting the BMP in mesoderm and maintain FGF expression.
C. In anterior region of the limb bud, Fgf8 positively regulates Etv4/5, which in turn repress Shh in this region, further reinforcing the posterior-to-anterior gradient of Shh from the ZPA.
D. In posterior region of the limb bud, Fgf8 positively regulates Etv4/5, which in turn repress Shh in this region, further reinforcing the posterior-to-anterior gradient of Shh from the ZPA.
Which of the following combinations are incorrect?
#Question id: 10678
#Unit 10. Ecological Principles
In competitive species N1 and N2, four individuals of N2 use the same resource as one individuals of N1. According conversion factor, what is the value of per capita competitive effect of N2 on N1(α) and per capita effect of N1 on N2 ( β) respectively?