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相关概念视频

Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
Dosage Compensation02:50

Dosage Compensation

In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with  distinct numbers of X chromosomes will have...

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相关实验视频

Updated: Jun 30, 2026

Microsurgical Obstruction of Testes Fusion in Spodoptera litura
03:38

Microsurgical Obstruction of Testes Fusion in Spodoptera litura

Published on: July 16, 2021

在雌性玉米耳虫中,大脑因子控制了性费洛蒙的产生.

A K Raina, J A Klun

    Science (New York, N.Y.)
    |August 3, 1984
    PubMed
    概括

    一种大脑激素控制了玉米耳 (Heliothis zea) 的雌性的性激素产量. 这种物质仅在scotophase (黑暗时期) 释放到血淋巴中,以刺激费洛蒙释放.

    科学领域:

    • 昆虫学 昆虫学是一门学科.
    • 神经内分泌学神经内分泌学
    • 昆虫生理学 昆虫生理学

    背景情况:

    • 性费洛蒙对于昆虫的繁殖至关重要.
    • 昆虫行为的荷尔蒙调节是复杂的和特定于物种的.

    研究的目的:

    • 为了研究雌性玉米耳,Heliothis zea.雌性玉米耳,Heliothis zea.雌性玉米耳,Heliothis zea.雌性玉米耳,Heliothis zea.雌性玉米耳,Heliothis zea.雌性玉米耳,Heliothis zea.
    • 为了确定激素刺激物质的来源和释放时间.

    主要方法:

    • 分析来自雌性玉米耳蝶的脑部提取物.
    • 在不同的光/黑暗周期期间测试血淋巴的刺激活性.
    • 对来自雄性和其他物种的大脑提取物的比较分析.

    主要成果:

    • 控制性激素产生的一种荷尔蒙物质存在于雌性玉米耳虫的大脑中.
    • 这种物质仅在scotophase (黑暗时期) 释放到血淋巴中.
    • 在雄性玉米耳虫和其他物种的大脑中发现了类似的刺激活性.

    结论:

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    Mass-Rearing and Molecular Studies in Tortricidae Pest Insects
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  • 大脑产生一种荷尔蒙,调节雌性玉米耳虫蝶性爱激素的产生.
  • 费洛蒙的产生处于昼夜控制之下,荷尔蒙的释放定时到scotophase.
  • 已识别的荷尔蒙物质可能在不同物种的激素调节中发挥着保留作用.