PATHOLOGY

Detailed explanation-1: -The embryos of two different organisms are observed to have similar features. What is the most reasonable conclusion that can be drawn from this observation? These organisms are related by a shared common ancestor.

Detailed explanation-2: -Embryos of different species have differences and similarities in structures up to a certain period during gestation. Human, pig, reptile, and bird embryos have similar embryonic development but as they grow, they transform into their respective species. This demonstrates common ancestry.

Detailed explanation-3: -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-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: -What can you conclude about the relationship between the similar appearances of the animal embryos during the phylotypic stage? The more physical features that embryos of various animals share between each other the greater the likelihood they are derived from a common ancestor.