Give one example of homology and explain why homology is evidence for evolution.

Homology is the similarity in the structure or function of organs. The organs which show homology are homologous organs. These are the outcome of similar embryonic origin and development therefore, it is evidence for evolution. Wings in birds and bats are the example for homology. Both birds and bats belong to different classes (Aves and Mammals) of the vertebrates but their wings are dissimilar in structure but have same function i.e flying.

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

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