Traits that are derived from a common ancestor, like the bones of human arms and bird wings, are said to be homeo

The bones of human arms and bird wings are said to be homologous organs. Homologous organs are those which are similar in structure but dissimilar in their functions. These structures are inherited from a common ancestor and have similar developmental pattern. They have the same type of bones, blood vessels, nerves, muscles, etc. but perform different functions in different animals.

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).

explanation: