Check sibling questions

Observe this family tree:


  • Imagine from the point of view of the boy labelled ‘Me’
    • He is similar to his brother . They share common characteristics.
    • This is because they have a recent common ancestor, their parents .
    • But the similarities between the boy and his cousins are even less .
    • This is because they do not have recent common ancestors .
    • But they will still share some common characteristics as their grandparents are common ancestors .
  • Similarly for all organisms, we can trace backwards and find similarities and differences.  
  • If we trace backward we can even reach a single species that gave rise to all species we know today.
  • Different theories of the origin of life are discussed by scientists.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo