Friday, June 29, 2012

Homologus & Analogus

1. A) The Whale and the Human possess a Homologous trait, this trait is the fin bones of the whale and the arm bones of the human.

    B) They both have a large upper arm bone, a lower part of the limb is made up of two bones, a large bone on one side and a small bone on the other side. Both have similar smaller bones in the "wrist" area. The use of the whale fin is completely different from humans, their function of the fin is used to swim solely. The human arm and hand is used for a multitude of things; such as, picking things up, grabbing, swings, holding, etc.. The structure of both are very similar if you look at pictures below.
  C) The common ancestor for these two species are the Chimpanzee, I know they both have the same
 bones in the slightly same structure and also I researched it finding it true.


2. A) Insects and Vertebrates (Humans) both possess Analogous trait of the legs because they evolved with same traits for environment, but did not inherit it through common ancestor.

    B) Both these species use this trait to climb, jump, walk, attack, and protect etc.. The structure of the species are also similar, though not exact both have an upper and lower part of the leg that bends.
 C) The last common ancestor of these two species is a legless worm, but this species does not possess the analogous trait that the other two species possess.


1 comment:

  1. Your homologous trait of the forelimb of whales and humans is a good choice. The description of the trait was well done, but a little more background on the animals themselves would have been preferred.

    The ancestor was a mammal, but the chimpanzee is a modern organism that evolved concurrently with both organisms. It could not have been an ancestor of either. Choosing a particular ancestor wasn't necessary, just an understanding that the ancestor was some type of mammal who possessed this trait.

    Good job on the analogous trait and good analysis on the common ancestor.