The correct answer is "each of the MHC genes has a large number of alleles, but each individual only inherits two for each gene".
Explanation:
In normal conditions, an individual has only two different alleles for a given gene: one inherited from his mother and the other from his father. However, this does not mean that among humans, there are only two different alleles for each gene. The major histocompatibility (MHC) genes are a clear example of this, since there are multiple combinations for each MHC class. For instance, there are 40 very similar alleles only for the HLA-B27 subtype.
The proportion of mottled fish will
increase over time because of the construction company that dumps a load of
gravel in the bottom of the lake which give it a mottled appearance that made
the mottled fish invisible by their major predator which is the wading bird that hunts them
by sight.
