What is a human arm homologous with?
The human arm is composed of the same set of bones, i.e. humerus, radius, and ulna, just as the arms of the other animals included in the figure. The figure shows the bones that make up the different animal forelimbs. Notice that their forelimbs have the same bone components. They are examples of homologous structures.
Which is a homologous structure to the human forearm leg of a horse?
Bat and bird wings, the front leg of a horse, the flipper of a whale, and the arm of a human are homologous structures.
Are human arms homologous structures?
An example of homologous structures are the limbs of humans, cats, whales, and bats. Regardless of whether it is an arm, leg, flipper or wing, these structures are built upon the same bone structure. Homologies are the result of divergent evolution.
What are 3 examples of homologous structures?
Following are some examples of homology: 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.
Which is a homologous structure to the human form?
A great example of homologous structures are the wings of a bat and the arms of a human. Bats and humans are both mammals, so they share a common ancestry. Both a bat’s wing and a human’s arm share a similar internal bone structure, even though they look very different externally.
Which would be a homologous structure to a human arm bone?
The flipper of a whale, the wing of a bat, and the leg of a cat are all very similar to the human arm, with a large upper “arm” bone (the humerus in humans) and a lower part made of two bones, a larger bone on one side (the radius in humans) and a smaller bone on the other side (the ulna).
Is a bat homologous or analogous?
Sometimes it is unclear whether similarities in structure in different organisms are analogous or homologous. An example of this is the wings of bats and birds. These structures are homologous in that they are in both cases modifications of the forelimb bone structure of early reptiles.
Is a dragonfly wing a homologous structure?
The wings both share similar structural features. When organisms share similar characteristics along with a common ancestor, we say that their characteristics are homologous structures. The wings of butterflies and dragonflies are homologous structures.
What are some examples of analogous and homologous structures?
Homologous structures share a similar embryonic origin; analogous organs have a similar function. For example, the bones in the front flipper of a whale are homologous to the bones in the human arm. These structures are not analogous. The wings of a butterfly and the wings of a bird are analogous but not homologous.
Is human arm and whale flipper homologous?
Homologous structures share a similar embryonic origin. … For example, the bones in a whale’s front flipper are homologous to the bones in the human arm. These structures are not analogous. A butterfly or bird’s wings are analogous but not homologous.
Is a frog homologous or analogous?
Forelimbs of frogs and lizards are the example of homologous organs. Homologous structures are the anatomically similar structures that have a common ancestor. Even if they are superficially different, they are developmentally related.
Are butterfly wings and bird wings homologous or analogous structures?
Homologous structures share a similar embryonic origin; analogous organs have a similar function. For example, the bones in the front flipper of a whale are homologous to the bones in the human arm. These structures are not analogous. The wings of a butterfly and the wings of a bird are analogous, but not homologous.
What are fins homologous to?
The paired fins in fish and limbs in tetrapods are a good example of homologous organs. They were derived from locomotive organs in common ancestors of vertebrates, and they share many developmental processes and genetic networks.
What kinds of structures are the arm of a human and the forelimb of a horse?
All vertebrate forelimbs are homologous, meaning that they all evolved from the same structures. For example, the flipper of a turtle or of a dolphin, the arm of a human, the foreleg of a horse, and the wings of both bats and birds are ultimately homologous, despite the large differences between them.
Which structure is homologous to the wing of a bird?
The wing of a bird and flipper of a whale are structurally forelimbs, which consist of humerus, radio-ulna, carpals, metacarpals and digits but they perform different function.
What do pectoral fins do?
Pectoral fins are located on either side of the fish near the gills. These fins do everything that pelvic fins do and also help steer and control depth.
Are flippers and wings homologous?
The flippers in whales and the wings in the birds are referred to as homologous because these organs have arisen through divergent evolution. These organisms, therefore, have a common ancestor.
What is a Heterocercal caudal fin?
A heterocercal tail is a caudal fin composed of two asymmetrical lobes. Often, such as the case in many sharks, the vertebral column passes through the upper lobe, making it the larger of the two lobes. A heterocercal tail is contrasted with a homocercal tail which has equal lobes.
Which shape is a forked caudal fin?
C shaped caudal fins are optimized for bursts of speed and are characteristic of open water predators like marlin, tuna, swordfish and sailfish. Deeply forked tails, such as pompano or permit fish (image: top right) are useful for more relaxed, but still faster swimming speeds.
What is a sharks top fin called?
The top fins are called dorsal fins. If there are two dorsal fins, the one nearest the head is called the first dorsal fin and the one behind it is the second dorsal fin.