What is human biological variation? Briefly examine various morphological characters used in understanding biological variation.

Human biological variation refers to the diversity in biological traits and characteristics that exist among individuals and populations within the human species. These variations can encompass a wide range of attributes, including genetics, physiology, morphology, and even behavior. Understanding human biological variation is essential in fields such as anthropology, genetics, medicine, and forensic science, as it helps us appreciate the complexity of the human species, its history, and its adaptation to diverse environments.

Biological variation can be categorized into several types:

1. Genetic Variation:
   - DNA Sequence: Genetic variation is primarily attributed to differences in DNA sequences. These variations can occur in the form of single nucleotide polymorphisms (SNPs), insertions, deletions, or larger structural changes.
   - Allelic Diversity: Variations in alleles, which are different versions of a gene, contribute to genetic diversity. Allelic variations can affect traits like eye color, blood type, and susceptibility to certain diseases.

2. Phenotypic Variation:
   - Morphological Traits: Morphological traits are physical characteristics of an organism, and they can vary significantly among humans. Some commonly studied _________ _____ ___ _________ ______ _____.
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