阿拉比多普西斯花的同源基因APETALA1的分子特征
M A Mandel1, C Gustafson-Brown, B Savidge
1Department of Biology, University of California, San Diego, La Jolla 92093-0116.
Nature
|November 19, 1992
概括
APETALA1基因通过调节花干系的身份,对启动花发育至关重要. 该基因编码了一种转录因子,该因子决定了Arabidopsis.的分叶和花发育.
科学领域:
- 植物生物学 植物生物学
- 发展遗传学 发展遗传学
背景情况:
- 花的发育涉及梅系统过渡和器官分化.
- 控制花髓系统和器官身份的基因已在模型植物中被确定,例如Arabidopsis thaliana.
研究的目的:
- 为了克隆和描述APETALA1基因.
- 调查APETALA1在花介质系统过渡和器官发育中的作用.
主要方法:
- 在APETALA的基因克隆1.1.
- 分析APETALA1基因表达模式 (RNA局部化).
主要成果:
- APETALA1编码了一个MADS域转录因子.
- APETALA1 RNA在年轻的花中表达,后来局部化到分枝和花上.
- APETALA1对于从花朵向花系统的过渡至关重要.
结论:
- APETALA1在本地作用,以指定花干系的身份.
- APETALA1在分叶和花发育中起着关键作用.
相关概念视频
01:20Monohybrid Crosses
Overview
01:18Dihybrid Crosses
Overview
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.
01:39Test Cross
Alleles are different forms of the same gene. Humans and other diploid organisms inherit two alleles of every gene, one from each parent.
02:27Trihybrid Crosses
Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...
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.