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#1
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" وراثة الصفات ك صبغة الشعر
السلام عليكم.
ارجوا من اختصاصين الوراثة او الامراض الوراثية افادتي .. هل صبغة الشعر او" الشيب المبكر" يكون صفة متنحية او سائدة .. وهل تنتقل الى الابناء وما مدى حدوث هذا.. |
مادة إعلانية
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#2
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At least two gene pairs control the overall human hair color. One gene, which is a brown/blonde pair, has a dominant brown allele and a recessive blonde allele. If a person carries the brown allele, he will have brown hair; otherwise, he will be blonde. This also explains why two brown-haired parents can produce a blonde-haired child. The other gene pair is a not-red/red pair, where the "not-red" allele (which suppresses production of phaeomelanin) is dominant and the allele for red hair is recessive. Since the two gene pairs both govern hair color, a person with two copies of the red-haired allele will have red hair, but it will be either auburn or bright reddish orange depending upon whether the first gene pair gives a brown or blonde hair color respectively. The recessive genes for both blonde and red hair are found nearly exclusively in populations of the Caucasian race.
However, the two-gene model cannot explain the various shades of brown, blonde, or red which may occur (for example, platinum blonde versus dark blonde/light brown), or why one blonde child's hair might turn brown as he grows up while another blonde child's hair does not. According to some research, there are several gene pairs that control the light versus dark hair color in an accumulative effect. Therefore, the more of these that are dominant, the darker the hair will be. اذا ما فهمت، غيري بيشرحلك او برجع اشرحلك بعدين |
#3
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I think u copied from a genetics textbook
so i think u have to translate it to Arabic ع العموم شكرا ع المعلومات المفيده |
#4
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اقتباس:
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#5
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زين تشرحلي بشرح مبسط...
ما انجليزي... |
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