d. Provide an image of each species in this comparison.
a. Briefly describe the two different species that possess the homologous trait.
A. The dog's leg is similar to the human arm. They both have carpals, a radius, and ulna as well as meta- carpals and digits.
b.Describe the homologus trait of each species, focusing on the differences in structure and
function of the trait. Why do these homologus traits exhibit differences between the two
species? Make sure your explanation is clear and complete.
A: The Homologus trait that I found interesting were the digits. Dogs seem to have 5 digits like we humans do. They do not have oposable thumbs and the fingers they have are meant to stand on as where we use our fingers to grasp things and make signs such as one, two, three, ect...
c. Who was (generally, not specifically) the common ancestor of these two species and how do
you know that ancestor possessed this homologus trait?
A. as far as research goes both have ancestral traces to whales.
2. For your analogous traits provide the following information.
d. Provide an image of each species in this comparison.
a. Briefly describe the two different species that possess the analogous trait.
A. Humans and Sharks are two different species that share some similarities when looking at the brain.
sharks are fish and humans are mammals of course. The cerebellum has the same function in sharks and humans. Sharks use it to their visionary advantage as well as their muscle movements. Where we use it for smooth body movements since it acts as a receptor that receives data from the spinal cord as well as sensory receptors to provide precise movement for the skeletal muscular system.
b. Describe the analogous trait of each species, focusing on the similarities in structure and
function of the trait. Clearly explain why these analogous traits exhibit similarities between
the two species.
A. The cerebellum is similar among both brains and the cerebellum is the part of the brain that coordinates the actions of muscles and helps maintain balance. Even though humans and sharks are completely different the cerebellum has the same function. Since Sharks are mostly composed of muscles and cartilage, we on the other hand are muscles and bone but with the help of the cerebellum both sharks and humans can keep their balance.
c. All pairs of organisms share some common ancestor if you go back far enough in time. Did
the common ancestor of these two species possess this analogous trait?
According to research I found that sharks have their own branch that derives from vertebrae as well as we humans do to. but they do not share a common ansestor
It's crazy to think that we could have once been closely related, if not, dogs ourselves. All these posts make it hard to believe how far humans have come. But what I want to know is how or why we separated ourselves from looking dog-like in some sense. Like why was there such distant change from a dog to a primate.
ReplyDeleteGood pairing on your homologous traits and you did fine on your descriptions. What environmental pressures differed in dogs and humans that lead to the differences in their hand/paw?
ReplyDeleteThe whale is in an evolutionary line separate from humans and dogs, so they are not an ancestor, but all you need to understand is that since humans and dogs are both mammals, their common ancestor was a mammal. All mammals in general share this common limb structure, which supports the fact that these two traits have a common genetic origin.
Your analogous trait, believe it or not, is actually homologous. The brain we carry in our heads can be traced back over millions of years of evolutionary history to the early fishes, which also gave rise to modern sharks. There is a direct line of descent between our brain and shark brains. Yes, shark brains are more rudimentary, but so were ours hundreds of millions of years ago!
A good example of an analogous trait was mentioned by another student earlier, namely the human eye and the eye of the octopus which arose independently from the human evolutionary line.