Phenotype is how an organism looks. Every organism has a characteristic size, weight, colour, number of body parts, etc. These characters can be easily observed or measured. After the introduction of binomial nomenclature taxonomy by Carolus Linnaeus, biologists got involved in defining species. At that time, the concept of genetics and molecular biology did not come up. Biologists had to define species with what they could easily observe in different organisms. This was the phenotype of the organisms. For example â€“ If there are two organisms 1 and 2, organism 1 is large, and organism 2 is small. So, biologists divided them into two separate species by just observing its size. Other characters are not analyzed.
Advantages of Morphological Species concept
The advantages are as follows- â€¢ In Morphological Species concept, classification is based on simple morphological characters. These morphological characters are easily observed or measured. â€¢ It is independent of other characters like genetical, physiological, etc. and hence less complicated. â€¢ It can be easily applied to both sexual and asexual organisms. â€¢ It is relatively easy to understand.
Disadvantages of Morphological Species concept The disadvantages are – â€¢ The phenotype of an organism can be influenced – The morphological species concept considers only the phenotype of an organism. However, this phenotype is influenced by different factors. Some of them are â€“ 1. Sexual dimorphism -In some organisms, the male or female of the same species can develop some external features that can completely make them look different. For example â€“ In some mammals, the male is usually larger than the females and appear different. 2. Colour â€“ Male or female of same species can exhibit different colors. This is done to prevent predators or for courtship. 3. Age â€“ With age, organisms change and can show some marked differences. For example, â€“ Two organisms might be indistinguishable based on the phenotypic characters but do not interbreed with each other. So, according to morphological species concept, they would belong to the same species, but it is wrong as they do not naturally interbreed with each other. Again, organisms of the same species might be divided based on the phenotypic characters that might appear a little different.
â€¢ Reproductive isolation – It is the key factor in establishing different species. Organisms of the same species are reproductively isolated by different barriers. Over time, they are separated and might look different. Based on morphology, they can be divided into separate species which is not entirely correct. It is because they could have mated with each other until reproductive isolation. â€¢ Evolution â€“ The morphological species concept does not consider the evolutionary history of organisms. Thus, it might place the non-related organisms into the same species. â€¢ Lifecycle â€“ Many organisms develop from larval stages. The larva and adult are completely different. However, according to this concept, they would be considered different species which is not true. Therefore, the morphological species concept was not accepted and hence replaced by the biological species concept.
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