Darwin had explained that a member of population could change ( evolved) and created variation
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However darwin could not explain how the variation occurred and how the variation were bequeathed
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Its still became a mystery until population genetic was discovered in 1930’s.
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Population genetic is of the biology branches studying evolution merchanism genetically. Population
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genetics aplies genetic principles in a population,that is by observing gene frequency alteration in the
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population of a long period
adverb
One of the principles included in population genetics is doing observation to the center of gene or gene
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pool.
Gene pool is total number of gene in the population . gene frequency in the population is constant
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and not change (evolved). If there is the change in gene frequency of a population , then it can be said
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that evolution has occurred . the evolution occuring in that level is called microevolution. For your
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information, beside miroevolution It is also known the term of makroevolution . makroevolution will
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be explained in the explanation on the origin and history of life on earth.
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Evolutionary change occurs from generation to generation , and the change causes the traits of
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descendants are different from those of the ancestors . evolutionary change cannot be observed in the
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one individual. We cannot conclude that human evolved and become taller just because there is an
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adult person who is two meters tall . evolutionary change related to body height can be observed by
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the measuring body height of the number of the people in several generation , then making the height
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average of each generation
Darwin telah menjelaskan bahwa anggota dari semua populasi dapat berubah ( berevolusi) menghasilkan variasi namun , darwin tidak dapat menjelaskan bagaimana jadinya variasi tersebut diturunkan . hal yang demikian tetap menjadi misteri hingga hingga ditemukannya genetika populasi pada tahun 1900-an.
Genetika populasi merupakan salah satu cabang biologi yang mempelajari mekanisme evolusi secara genetika . genetika populasi menerapkan prinsip-prinsip genetika pada suatu populasi yaitu dengan cara mengamati perubahan frekuensi gen pada suatu populasi di sepanjang waktu
Salah satu prinsip yang terkandung dalam genetika populasi adalah melakukan pengamatan terhadap pusat gen atau kolam gen ( pool gen). pusat gen adalah jumlah seluruh gen dalam populasi. Frekuensi di dalam populasi tersebut bersifat konstan atau tidak berubah ( tidak berevolusi ) di sepanjang waktu . jika terjadi perubahan frekuensi gen dalam populasi maka dapat dikatakan terjadi evolusi .evolus yang terjadi pada tingkat demikian disebut evolusi mikro atau mikroevolusi. Perlu kamu ketahui,selain miroevolusi dikenal juga istilah makroevolusi. Makroevolusi akan dijelaskan pada bahasan tentang asal usul dan sejarah kehdupan di muka bumi.
Perubahan evolusioner terjadi dari generasi ke generasi dan perubahan tersebut menyebabkan sifat dar suatu keturunan berbeda dengan moyangnya . perubahan evolusioner tida dapat diamati pada suatu individu . kta tidak dapat menyimpulkan bahwa manusa berevolusi menjadi lebih tinggi karena hanya ada satu orang dewasa yang mempunyai tinggi badan dua meter . perubahan evolutioner menyangkut tinggi badan dapat diamati dengan mengukur tinggi badan sejumlah besar orang pada beberapa generasi , kemudian membuat rata-rata tinggi badan pada setiap generasi .
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