what are the characteristics of homologous organ in points
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Etymology
A homophone is a word that sounds the same as another but has a different meaning. If a group is homogenous, all of its members are uniform or consistent. A homosexual is a person sexually attracted to a member of the same sex. Noticing a pattern? Words with the prefix 'homo' all have the idea of sameness in their meaning. We will be continuing with this etymology as we discuss the various definitions of 'homologous' that are found in biology.
The term homologous comes from the Greek 'homos' meaning same and 'logos' meaning relation. So, literally, it means having the same relation. To make that a little clearer, we can say it means having a similar relative position, structure, function or origin. However, that definition is still somewhat broad and ambiguous. The reason for this is because the term 'homologous' is used in several different fashions in biology. The individual definitions are more specific, but they are all derived from the idea of 'having the same relation.' In this lesson, we will discuss homologous structures, homologous chromosomes and homologous organs in males and females.
Homologous Structures
A homologous structure is an organ, system, or body part that shares a common ancestry in multiple organisms. This definition is found in evolutionary biology and uses the meaning of having a similar structure or origin.
Common examples of homologous structures are the bones in the forelimbs of various vertebrates, such as humans, dogs, birds and whales. Even though the functions of these limbs are different (a human hand is for grasping, a dog's foot is for walking, a bird's wing is for flying, and a whale's flipper is for swimming), they all have similar bone structures. In evolutionary biology, this is evidence for descent with modification from a common ancestor. For example, check out the forelimbs of four modern vertebrates. Compare these to the flipper bones of the three ancient, lobe-finned fishes, one of which could be the common ancestor of the modern vertebrates.
A homophone is a word that sounds the same as another but has a different meaning. If a group is homogenous, all of its members are uniform or consistent. A homosexual is a person sexually attracted to a member of the same sex. Noticing a pattern? Words with the prefix 'homo' all have the idea of sameness in their meaning. We will be continuing with this etymology as we discuss the various definitions of 'homologous' that are found in biology.
The term homologous comes from the Greek 'homos' meaning same and 'logos' meaning relation. So, literally, it means having the same relation. To make that a little clearer, we can say it means having a similar relative position, structure, function or origin. However, that definition is still somewhat broad and ambiguous. The reason for this is because the term 'homologous' is used in several different fashions in biology. The individual definitions are more specific, but they are all derived from the idea of 'having the same relation.' In this lesson, we will discuss homologous structures, homologous chromosomes and homologous organs in males and females.
Homologous Structures
A homologous structure is an organ, system, or body part that shares a common ancestry in multiple organisms. This definition is found in evolutionary biology and uses the meaning of having a similar structure or origin.
Common examples of homologous structures are the bones in the forelimbs of various vertebrates, such as humans, dogs, birds and whales. Even though the functions of these limbs are different (a human hand is for grasping, a dog's foot is for walking, a bird's wing is for flying, and a whale's flipper is for swimming), they all have similar bone structures. In evolutionary biology, this is evidence for descent with modification from a common ancestor. For example, check out the forelimbs of four modern vertebrates. Compare these to the flipper bones of the three ancient, lobe-finned fishes, one of which could be the common ancestor of the modern vertebrates.
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Definition
Homologous structures are organs or skeletal elements of animals and organisms that, by virtue of their similarity, suggest their connection to a common ancestor. These structures do not have to look exactly the same, or have the same function. The most important part, as hinted by their name, is that they are structurally similar.
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