A phenotype results from the expression of an organism's genes as well as the influence of environmental factors and the interactions between the two. When two or more clearly different phenotypes exist in the same population of a species, the species is called polymorph.The genotype of an organism is the inherited instructions it carries within its genome.he concept of phenotype can be extended to variations below the level of the gene that affect an organism's fitness. For example, silent mutations that do not change the corresponding amino acid sequence of a gene may change the frequency of guanine-cytosine base pairs (GC content).
President Woodrow Wilson persistently vetoed the Immigration Act of 1917, however Congress overrode his veto and put this law into effect in May 1917. This act increased the head tax on each adult immigrant to $8, barred most Asian immigrants, and required all adults to take a literacy test.
A. Presidents have had the line item veto since 1995. B. Congress is generally unsuccessful at overturning presidential vetoes. C. Presidents use the veto more frequently when their party does not control Congress. D. George W. Bush was the third president not to veto a bill in his first term. E. The threat of a veto is a powerful tool in presidential negotiations with Congress. Presidents have had the line item veto since 1995.