1.
Frogs and rabbits share homologies. Frogs are amphibians. They have a short body, have 4 limbs, and do not have any tail. They live on land and in water. Rabbits are small mammals in the family Leporidae. They also have 4 legs, long ears and a short tail. They only live on land.
Although their forelimbs seem different, they share the same set of homologous bones – the humerus, radius, and the ulna, which implies that they share the same common ancestor.
The function of the forelimbs of the frog serves to steer when the frog is swimming and absorb the shock of landing when the frog is jumping on land. The forelimbs of rabbits also serve to support and balance the boy at rest, as well as to absorb the shocks when hopping.
Rabbits and frogs share the same common ancestor. Both species evolved from a group of dinosaurs known as theropods during the Mesozoic Era.
Image of a frog
2. Butterflies and birds share analogies. Butterflies are flying insects, which are very small in size. They have 4 wings, 6 legs, and an antenna. Birds also have wings, but they only have two. Their bodies are covered with feathers. They also have a beak. Although these 2 species possess wings, the anatomy of these two species is very different.
For one, butterflies are insects. Insects are anthropods. Like all insects, they have six jointed legs, 3 body parts, a pair of antennae, compound eyes, and an exoskeleton. The three body parts are the head, thorax, and abdomen. Birds though have an internal skeleton, a central system, and four limbs. Birds are aves.
The butterfly’s wing is analogous to the wings of the birds because the common ancestor of the butterfly and the bird (a reptile) did not possess wings.
Insects evolved during the Silurian Period, 438 to 408 mya (long before the dinosaurs appeared), whereas birds evolved from theropods during the Mesozoic era.
Image of bird Image of a butterfly
Skeleton of birds
Skeleton of Forelimbs of Frog
I’m not sure if your choice of frogs and rabbits is appropriate for a homologous trait, but it definitely is an original choice. Your choice for an analogous trait in birds and butterflies is perfect and shows how two completely different species can have a similar trait.
ReplyDeleteI like that you compared rabbits to frogs, its interesting how this blog has made me realize how every species must have a common ancestor with another totally different species. I loved you comparison of butterflies to birds. It actually reminded me of an article I read http://www.ncbi.nlm.nih.gov/books/NBK10049/! Great post!
ReplyDeleteGreat images!
ReplyDeleteYour post was excellent as well, with one small correction: The ancestor between the frog and the rabbit would have been an amphibian, since frogs are amphibians themselves and arose before the dinosaurs, who were reptiles.
Otherwise, nicely done.
I did not know that the frogs and the rabbit would share a close ancestor that can be seen in the same set og bones they share. Great job on the analogous one too.
ReplyDelete