Polygenic traits are quantitative because their phenotype expression depends on several different alleles found on different chromosomes.
Explanation:
<em>In this case each dominant capital gene produces one unit of skin color, therefore, a wide range of intermediate skin colors are produced depending on the number of dominant capital genes. </em>
Mutualism is a type of symbiosis; this is a term that describes any relationship between two organisms. Specifically, mutualism describes a relationship between two organisms (a host and a symbiont) where both benefit in some way. We find these relationships in animals, plants, and even in ourselves
In obligate mutualism, one organism cannot survive without the other. This term is easy to remember because both organisms are obligated, or forced to, rely on one another.
An example of obligate mutualism is the relationship between ants and the Acacia plant. The plant provides food for the ant, as well as shelter. In return, the ants defend the plant from other herbivores or organisms that eat plants, as well as remove other plants from the vicinity of their plant so it can grow better.
Another example is the mycorrhizal (pronounced 'my-core-rye-Zal') fungi that live on plant roots. The plant roots take advantage of the increased water uptake from the fungi, and the fungi get nutrients from the plant.
Hence, the answer is " the bacteria will die without their mutualistic aphids, as this is an example of the obligate mutualistic relationship"
The rate of evaporation from the wet bandage on the bulb, and the temperature difference between the dry bulb and wet bulb, depends on the humidity of the air. The evaporation is reduced when the air contains more water vapor.