what do you call difference such as handedness among members of the same species
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Answer:
human biology, handedness is the better, faster, or more precise performance or individual preference for use of a hand, known as the dominant hand. The incapable, less capable or less preferred hand is called the non-dominant hand.[1][2][3] Right-handedness is the most common form, and about 90% of the world's population is right-handed.[4][5] Handedness is often defined by which hand one writes with, as it is fairly common for people to prefer to do some tasks with each hand. There are examples of true mixed-handedness; however, it is rare, with most people preferring one hand for most purposes.
Most of the current research would suggest that left handedness has an epigenetic marker, a combination of genetics, biology and the environment.
Because the vast majority of the population is right-handed, many devices are designed for use by a right-handed person, which makes their use by left-handed people more difficult.[6] In many countries across the world, left-handed people are or were required to write with their right hand. Left-handed people are also more prone to various health problems. However, left-handed people have an advantage in sports that involve aiming at a target, because their opponents will be more accustomed to the right-handed majority. As a result, they are over-represented in baseball, tennis, fencing, cricket, and boxing.[7]