相关概念视频
01:25What is Population Genetics?
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A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
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01:43Incomplete Dominance
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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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01:49Hardy-Weinberg Principle
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Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.
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01:49Law of Segregation
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When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
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01:35Pedigree Analysis
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Overview
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01:09Mutation, Gene Flow, and Genetic Drift
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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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在人口遗传学中重新审视主导地位
Chenlu Di1, Kirk E Lohmueller1,2,3
1Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA, USA.
Genome biology and evolution
|August 8, 2024
概括
统治性是种群遗传学的一个关键概念,它影响了突变频率和遗传变异. 估计主导系数具有挑战性,但对于理解进化和近亲繁殖效应至关重要.
科学领域:
- 人口遗传学 人口遗传学
- 进化生物学 进化生物学
- 遗传学 遗传学 是一个
背景情况:
- 主导性描述了与同卵性相对的异卵性基因型效应.
- 了解统治是人口遗传学的基础,由费舍尔,赖特和霍尔丹的早期工作.
- 估计主导系数在历史上一直具有挑战性,限制了经验研究.
研究的目的:
- 审查解释主导机制的理论模型.
- 讨论估计主导系数的方法,并总结现有的估计.
- 通过比较基因类型和物种之间的系数来测试关于主导性的假设.
主要方法:
- 对主导地位的理论和概念模型的审查.
- 对估计主导系数的各种方法的分析.
- 在物种,突变类型和基因功能的经验统治系数估计的比较.
主要成果:
- 在不同的生物环境中观察到主导系数的趋势.
- 用于测试有关存在主导地位的假设的经验数据.
- 洞察主导如何影响突变动态和内生抑郁症.
结论:
- 优势显著影响有益和有害突变的动态.
- 统治程度会影响内生生殖对人口健康的后果.
- 需要进一步的研究来完善估计主导系数及其进化影响的方法.