PATHOLOGY

Detailed explanation-1: -Comparing the embryos of different animals can show relationships that can’t be seen when comparing the fully formed animals. Why is this the case? Each embryo is unique; even embryos of animals of the same species can be different. When observing embryos, microscopes can be used to reveal more detail.

Detailed explanation-2: -Embryos of different species can have similarities that are not visible when the organisms are fully formed. Many of these similarities are homologous features. These features provide evidence that the species are related through evolution. embryos have homologous structures called pharyngeal arches, or gill arches.

Detailed explanation-3: -How does comparing the embryos of different organisms support the theory of evolution? The embryos of all organisms are identical. The stages of development of the embryos of different organisms are extremely similar, thereby suggesting common ancestors.

Detailed explanation-4: -DNA evidence for evolution Biologists often compare the sequences of related (or homologous) genes. If two species have the “same” gene, it is because they inherited it from a common ancestor. In general, the more DNA differences in homologous genes between two species, the more distantly the species are related.

Detailed explanation-5: -Similar structures that related species have inherited from a common ancestor. Structures found on one species that have the same basic structure and embryonic origin as those found on another species determines that those two species share a common ancestor.