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Zygosity is the degree of similarity of the alleles for a trait in an organism. Most eukaryotes have two matching sets of chromosomes; that is, they are diploid. Diploid organisms have the same loci on each of their two sets of homologous chromosomes, except that the sequences at these loci may differ between the two chromosomes in a matching pair and that a few chromosomes may be mismatched as part of a chromosomal sex-determination system. If both alleles of a diploid organism are the same, the organism is homozygous at that locus. If they are different, the organism is heterozygous at that locus. If one allele is missing, it is hemizygous, and, if both alleles are missing, it is nullizygous.

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  • اقترانية زيجوتية
  • Zigosidade
  • Zygosity
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  • الاقترانية الزيجوتية (بالإنجليزية: Zygosity) هي درجة التشابه بين الألائل التابعة لسمة ما في الكائن الحي. معظم حقيقيات النواة تمتلك مجموعتين متلائمتين من الكروموسومات، أي أنها ضعفانية. تتموضع عند هذه الكائنات الضعفانية نفس الجينات على مجموعتي الكروموسومات المتماثلة الخاصة بها، إلا أن تسلسل هذه الجينات قد يتفاوت بين زوج الكروموسومين، وبعض الكروموسومات تكون غير متلائمة كجزء من نظام تحديد الجنس.
  • Zigosidade refere-se a condição genética de um zigoto. Em genética, a zigosidade descreve a similaridade ou dissimilaridade de ADN entre cromossomas homólogos em uma específica posição alélica ou gene. Zigosidade é também usada para descrever a condição genética do(s) sigoto(s) dos quais gêmeos emergem, onde se refere à similaridade ou dissimilaridade do ADN dos gêmeos. Gêmeos idênticos são monozigóticos - desenvolvem-se de um zigoto (um ovo fertilizado que desenvolve-se em dois embriões). Gêmeos fraternos são dizigóticos - desenvolvem-se separadamente de dois zigotos (dois ovos fertilizados).
  • Zygosity is the degree of similarity of the alleles for a trait in an organism. Most eukaryotes have two matching sets of chromosomes; that is, they are diploid. Diploid organisms have the same loci on each of their two sets of homologous chromosomes, except that the sequences at these loci may differ between the two chromosomes in a matching pair and that a few chromosomes may be mismatched as part of a chromosomal sex-determination system. If both alleles of a diploid organism are the same, the organism is homozygous at that locus. If they are different, the organism is heterozygous at that locus. If one allele is missing, it is hemizygous, and, if both alleles are missing, it is nullizygous.
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  • الاقترانية الزيجوتية (بالإنجليزية: Zygosity) هي درجة التشابه بين الألائل التابعة لسمة ما في الكائن الحي. معظم حقيقيات النواة تمتلك مجموعتين متلائمتين من الكروموسومات، أي أنها ضعفانية. تتموضع عند هذه الكائنات الضعفانية نفس الجينات على مجموعتي الكروموسومات المتماثلة الخاصة بها، إلا أن تسلسل هذه الجينات قد يتفاوت بين زوج الكروموسومين، وبعض الكروموسومات تكون غير متلائمة كجزء من نظام تحديد الجنس. في الكائن الحي الضعفاني، إن كان زوج الأليلين المسؤولين عن سمة ما متماثلين، عندها يكون الكائن الحي ذاك متماثل الزيجوت (بالإنجليزية: homozygous) من ناحية هذه السمة. وإن كان الأليلان مختلفان، يكون الكائن الحي مغاير الزيجوت (بالإنجليزية: heterozygous) بالنسبة لتلك السمة. إن كان هناك أليل ناقص، عندها يدعى فرداني الزيجوت (بالإنجليزية: hemizygous)، وإن كان كلا الأليلان ناقصين، فإنه عديم الزيجوت (بالإنجليزية: nullizygous).
  • Zigosidade refere-se a condição genética de um zigoto. Em genética, a zigosidade descreve a similaridade ou dissimilaridade de ADN entre cromossomas homólogos em uma específica posição alélica ou gene. Os termos homozigoto, heterozigoto e hemizigoto são usados para simplificar a descrição do genótipo de um organismo diploide em um único locus genético. Em um gene ou em uma posição dada ao longo de um cromossoma (um locus), a sequência do ADN pode variar entre indivíduos na população. Os segmentos variáveis do ADN são referidos como alelos, e os organismos diplóides têm geralmente dois alelos em cada locus, um alelo para cada um dos dois cromossomos homólogos. Indicado simplesmente, homozigoto descreve dois alelos idênticos ou sequências do ADN em um locus, heterozigoto descreve dois alelos diferentes em um locus, e hemizigoto descreve a presença de somente uma única cópia do gene em um organismo de outra maneira diplóide. Zigosidade é também usada para descrever a condição genética do(s) sigoto(s) dos quais gêmeos emergem, onde se refere à similaridade ou dissimilaridade do ADN dos gêmeos. Gêmeos idênticos são monozigóticos - desenvolvem-se de um zigoto (um ovo fertilizado que desenvolve-se em dois embriões). Gêmeos fraternos são dizigóticos - desenvolvem-se separadamente de dois zigotos (dois ovos fertilizados). Para uma mais completa descrição destes termos e variações, ver o artigo "gêmeos". de:Hemizygotie fr:Hémizygoteid:Hemizigotpl:Hemizygotaru:Гемизиготаuk:Гемізигота
  • Zygosity is the degree of similarity of the alleles for a trait in an organism. Most eukaryotes have two matching sets of chromosomes; that is, they are diploid. Diploid organisms have the same loci on each of their two sets of homologous chromosomes, except that the sequences at these loci may differ between the two chromosomes in a matching pair and that a few chromosomes may be mismatched as part of a chromosomal sex-determination system. If both alleles of a diploid organism are the same, the organism is homozygous at that locus. If they are different, the organism is heterozygous at that locus. If one allele is missing, it is hemizygous, and, if both alleles are missing, it is nullizygous. The DNA sequence of a gene often varies from one individual to another. Those variations are called alleles. While some genes have only one allele because there is low variation, others have only one allele because deviation from that allele can be harmful or fatal. But most genes have two or more alleles. The frequency of different alleles varies throughout the population. Some genes may have two alleles with equal distribution. For other genes, one allele may be common, and another allele may be rare. Sometimes, one allele is a disease-causing variation while the other allele is healthy. Sometimes, the different variations in the alleles make no difference at all in the function of the organism. In diploid organisms, one allele is inherited from the male parent and one from the female parent. Zygosity is a description of whether those two alleles have identical or different DNA sequences. In some cases the term "zygosity" is used in the context of a single chromosome.
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