Chromosome 2 in Homo sapiens formed when two smaller chromosomes fused,after the chimpanzee and human lineages split.As a result,humans have 23 pairs of chromosomes and chimpanzees have 24 and can no longer form fertile offspring (Fig.14.31) .This would be an example of: 
Definitions:
Social Impact
The effect of an activity on the social fabric of the community and well-being of the individuals and families.
Presbycusis
Age-related hearing loss, typically affecting both ears and resulting from changes in the inner ear or auditory nerve.
Presbyopia
A common age-related condition where the eye loses its ability to focus on close objects, often noticeable in middle age.
Osteoarthritis
A degenerative joint disease characterized by the breakdown of joint cartilage and underlying bone, leading to pain and stiffness.
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