The 20th century as of now
Alleles are "genes these genes specifically can determine what the offspring can inherit phenotypic wise." Phenotypic is the offsprings psychical form, color, structure, height, etc...
Hope this helps.
The answer that fits the given blank is GENE POOL OVER TIME. The Modern Synthesis is a theory that is a combination of Mendel's and Darwin's study of evolution and genetics. And this theory affirms that the changes in population's gene pool over time is being involves evolution.
Answer: salivary glands
Explanation: i just remember from 4th grade health class
DNA fingerprinting is a laboratory technique used to establish a link between biological evidence and a suspect in a criminal investigation. ... Conversely, if the two DNA profiles do not match, then the evidence cannot have come from the suspect. DNA fingerprinting is also used to establish paternity.