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Multilingual Demographic Dictionary, second unified edition, English volume

91

Multilingual Demographic Dictionary, second unified edition, English vol.
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The harmonization of all the second editions of the Multilingual Demographic Dictionary is an ongoing process. Please consult the discussion area of this page for further comments.


Go to: Introduction to Demopædia | Instructions on use | Downloads
Chapters: Preface | 1. General concepts | 2. The treatment and processing of population statistics | 3. Distribution and classification of the population | 4. Mortality and morbidity | 5. Nuptiality | 6. Fertility | 7. Population growth and replacement | 8. Spatial mobility | 9. Economic and social aspects of demography
Pages: 10 | 11 | 12 | 13 | 14 | 15 | 16 | 20 | 21 | 22 | 23 | 30 | 31 | 32 | 33 | 34 | 35 | 40 | 41 | 42 | 43 | 50 | 51 | 52 | 60 | 61 | 62 | 63 | 70 | 71 | 72 | 73 | 80 | 81 | 90 | 91 | 92 | 93
Index: Global Index | Index of chapter 1 | Index of chapter 2 | Index of chapter 3 | Index of chapter 4 | Index of chapter 5 | Index of chapter 6 | Index of chapter 7 | Index of chapter 8 | Index of chapter 9


910

In eugenics 1, a discipline which seeks to improve the quality of the population, attention is directed primarily to the role of heredity 2, the transmission of hereditary characteristics 3, such as the color of the eyes, from generation to generation. Acquired characteristics 4 are not so transmitted. A lethal characteristic 5 generally brings about the early death of the foetus.

  • 1. Eugenics, n. - eugenic, adj. - eugenist, n.: a specialist in eugenics.
  • 2. Heredity, n. - hereditary, adj.

911

The transmission of hereditary characteristics operates through genes 1 which are transmitted to children by their parents. Genetics 2 is the science concerned with the transmission and effects of hereditary factors. The genes are carried by chromosomes 3 which are long filaments of DNA (deoxyribonucleic acid) located in the cell’s nucleus. The position of a gene on a chromosome is called its locus 4. Genes occupying the same locus affect the same characteristic, although they do so in various ways which correspond to various alleles 5 of the gene in this locus. The new cell formed by the union of two sexual cells or gametes 6 during the process of conception (602-1) is called a zygote 7.

  • 1. All of the genes carried by an individual are collectively called his or her genetic endowment
  • 2. Genetics, n. - genetic, adj. - geneticist, n.: a specialist in genetics.

912

The set of two genes of an individual at the same locus is called a genotype 1; the genotype is said to be homozygous 2 if the alleles are identical at a given locus; it is said to be heterozygous 3 in the opposite case. The phenotype 4 consists in the observable characteristics as determined by the genotype and the environment. If an heterozygous individual (AA’) cannot be distinguished from an homozygous individual (AA), the allele A is said to be dominant 5 over allele A’, and A’ is said to be recessive 6. Genes are subject to sudden and apparently random changes, called mutations 7. Panmixia 8 or random mating 8 insures uniform distribution of genes within populations.

  • 7. Mutation, n. - mutant, adj. or n.

913

Perbezaan sering dibuat dalam dasar eugenik antara eugenik positif 1, bertujuan untuk meningkatkan bilangan orang yang dipercayai mempunyai ciri yang diingini, dan eugenik negatif 2 yang bertujuan untuk menghalang pembiakan orang yang dijangka akan memindah ciri yang tidak diingini atau kecacatan keturunan 3. Banyak perhatian telah diberikan kepada perbincangan pensterilan eugenik 4,yakni pensterilan orang yang berkemungkinan untuk mewarisi ciri yang tidak diingini kepada keturunan mereka. Bantahan terhadap langkah ini telah dibangkitkan atas alasan moral dan juga kerana keberkesanannya yang agak rendah dalam mengurangkan kekerapan gen resesif (912-6). Antara langkah yang dicadangkan adalah pemeriksaan pra perkahwinan 5 bertujuan untuk memberi pasangan yang ingin berkahwin pengetahuan mengenai kualiti zuriat mereka supaya bakal pasangan perkahwinan disgenik 6,yakni, orang-orang yang berkemungkinan menghasilkan anak cacat dapat diberi amaran.

914

The probability that an individual of reproductive age will have a given number of offspring who also attain reproductive age may depend on his genotype (912-1). This differential reproduction is called selection 1. The selective value 2 or fitness value 2 of a genotype is the relative number of children of individuals with the genotype who survive to reproductive age. The mean selective value 3 or fitness 3 of a population is equal to the average of the selective values for the genotypes of its members. The genetic load 4 of the population is the relative decline in the mean value of fitness resulting from the presence of different genotypes with varying fitness values. Random fluctuation of the frequency with which a specific gene is found in different generations of a population is called the genetic drift 5. The gene structure 6 of a population refers to the distribution of the frequencies of different alleles (911-5) on a given locus (911-4) within the members of the population. The genotypic structure 7 of a population refers to the distribution of different genotypes on the same locus.


Kebarangkalian seseorang individu yang berada dalam umur biak akan mempunyai bilangan keturunan tertentu yang juga mencapai umur biak bergantung kepada genotip (912-1). genotip (912-1). Reproduksi bezaan ini dipanggil pemilihan 1. Nilai terpilih 2 or nilai kecergasan 2 Nilai-nilai terpilih 2 atau nilai-nilai kecergasan2 sesebuah genotip adalah bilangan relatif anak yang mempunyai genotip yang hidup sehingga umur biak. {TextTerm|Min nilai pilihan|3|914|IndexEntry=min nilai pilihan|OtherIndexEntry= nilai pilihan, min}} or kecergasan 3 penduduk adalah bersamaan dengan purata nilai memilih untuk genotip ahli-ahlinya. Beban genetik penduduk adalah penurunan relatif dalam nilai min kecergasan akibat dari kehadiran genotip berbeza dengan pelbagai nilai kecergasan. Turun naik rawak kekerapan gen yang khusus dijumpai dalam generasi penduduk berbeza dipanggil hanyutan genetik. Struktur gen penduduk merujuk kepada pengagihan frekuensi alel berbeza (911-5) pada lokus yang diberikan (911-4) dalam kalangan penduduk. Struktur genotip penduduk merujuk kepada pengagihan genotip yang berlainan pada lokus yang sama.

915

In the case of an inbred individual, i.e., an individual whose parents have a common ancestor, two genes are said to be identical genes 1 by descent, if both were carried by the same ancestor and are on the same locus. The probability that an individual chosen at random in a population carries two genes identical by descent is the coefficient of inbreeding 2 of the population. The coefficient of kinship 3 of a population is the probability that two individuals chosen at random in that population carry genes identical by descent on the same locus.

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Go to: Introduction to Demopædia | Instructions on use | Downloads
Chapters: Preface | 1. General concepts | 2. The treatment and processing of population statistics | 3. Distribution and classification of the population | 4. Mortality and morbidity | 5. Nuptiality | 6. Fertility | 7. Population growth and replacement | 8. Spatial mobility | 9. Economic and social aspects of demography
Pages: 10 | 11 | 12 | 13 | 14 | 15 | 16 | 20 | 21 | 22 | 23 | 30 | 31 | 32 | 33 | 34 | 35 | 40 | 41 | 42 | 43 | 50 | 51 | 52 | 60 | 61 | 62 | 63 | 70 | 71 | 72 | 73 | 80 | 81 | 90 | 91 | 92 | 93
Index: Global Index | Index of chapter 1 | Index of chapter 2 | Index of chapter 3 | Index of chapter 4 | Index of chapter 5 | Index of chapter 6 | Index of chapter 7 | Index of chapter 8 | Index of chapter 9