LIFE SCIENCE

Detailed explanation-1: -Homologous structures are structures that are similar in related organisms because they were inherited from a common ancestor. These structures may or may not have the same function in the descendants. Figure below shows the hands of several different mammals. They all have the same basic pattern of bones.

Detailed explanation-2: -Structures inherited from a common ancestor are called homologous structures, or homologies.

Detailed explanation-3: -Structures which have a common basic structure but perform different functions are called homologous structures. For example, forelimbs of reptiles, amphibians and mammals. Yes, they have common ancestor but variously modified to carry out different activities. Analogous organs have different basic structure.

Detailed explanation-4: -Similar traits can be either homologous or analogous. Homologous structures share a similar embryonic origin; analogous organs have a similar function. For example, the bones in the front flipper of a whale are homologous to the bones in the human arm. These structures are not analogous.