AP BIOLOGY

Detailed explanation-1: -If two or more species share a unique physical trait they may all have inherited this trait from a common ancestor. Traits that are shared due to common ancestry are homologous structures. The similar bone arrangement of the human, bird, and whale forelimb is a structural homology.

Detailed explanation-2: -Homologous structures are structures that are similar in related organisms because they were inherited from a common ancestor.

Detailed explanation-3: -Homologous structures are similar physical features in organisms that share a common ancestor, but the features serve completely different functions. An example of homologous structures are the limbs of humans, cats, whales, and bats.

Detailed explanation-4: -The arm of a human, the wing of a bird or a bat, the leg of a dog and the flipper of a dolphin or whale are homologous structures. They are different and have a different purpose, but they are similar and share common traits.

Detailed explanation-5: -Homologous structures are similarities throughout a group of closely related species. The similar bone patterns in bat’s wings, dolphin’s flippers, and horse’s legs support their descent from a common mammalian ancestor.