Why Are Some People Left-Handed and Others Right-Handed?

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Across
  1. 2. The quality of not being made up of exactly similar parts facing each other; a lack of symmetry.
  2. 4. The genetic process of passing on traits from parents to their offspring.
  3. 5. To make someone more likely or inclined to a specific condition or attitude without guaranteeing it.
  4. 8. Describing something in its most basic, undeveloped, or earliest form.
  5. 10. The specialization of function in one side of the brain or the other.
  6. 14. A biological trait that is controlled or influenced by more than one gene.
  7. 15. A powerful mark of social disgrace or shame attached to a particular circumstance or person.
  8. 18. A division or contrast between two things that are presented as being completely opposed.
  9. 19. A word for something that is highly detailed and complicated, with many interwoven parts.
Down
  1. 1. The physical appearance or embodiment of an abstract idea, quality, or feeling.
  2. 3. A proposed explanation made on the basis of limited evidence as a starting point for further investigation.
  3. 6. The rare ability to use both the left and the right hand with equal skill.
  4. 7. The physical act and particular style of a person's handwriting.
  5. 9. A mutual relationship or connection between two or more things, though not necessarily a causal one.
  6. 11. Not certain or fixed; describing a plan or conclusion that is provisional and subject to change.
  7. 12. A quality or habit that is so firmly established in a person or system that it's very difficult to change.
  8. 13. A word that now means evil or threatening, but originally came from the Latin word for "left."
  9. 14. The quality of being the main, strongest, or most influential element in a situation.
  10. 16. The act of combining a number of things into a single, more effective or coherent whole.
  11. 17. A person or thing that precipitates an event or change, speeding up a process.