概括
哈尔丹法则解释了为什么一个性别在杂交后代中是无菌的. 在Drosophila中,这种不孕不育是由X和Y染色体之间的相互作用引起的,而不是性染色体-自生体不平衡.
科学领域:
- 遗传学 是一个遗传学.
- 进化生物学 进化生物学
- 生殖隔离 生殖隔离
背景情况:
- 哈尔丹规则描述了F1杂交品种的性别特异性不育.
- 这一规则适用于各种动物种类,包括哺乳动物和昆虫.
- 哈尔丹统治的遗传基础在很大程度上仍然无法解释.
研究的目的:
- 为了调查霍尔丹在Drosophila中的统治的遗传基础.
- 为了确定性染色体与自身染色体不平衡或性染色体相互作用是否导致杂交不育.
主要方法:
- 在Drosophila melanogaster亚组内对跨物种杂交的分析.
- 检查F1后代的生育模式.
主要成果:
- 在Drosophila melanogaster亚群中,可以观察到哈尔丹的生育规则.
- 杂交后代的一个性别的不育性与X和Y染色体之间的遗传相互作用有关.
- 证据不支持性别染色体和自生体之间的不平衡作为主要原因.
结论:
- 这些发现表明,X-Y染色体相互作用是Drosophila.Haldane规则的关键驱动因素.
- 这对理解物种之间生殖隔离的演变有重大意义.
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相关概念视频
01:11Genetic Lingo
Overview
01:49Hardy-Weinberg Principle
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.In the early 20th century,...
01:49Law of Segregation
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.
02:03Law of Independent Assortment
While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
01:39Chromosomal Theory of Inheritance
In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
01:43Incomplete Dominance
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.