相关实验视频
Updated: Sep 11, 2025
07:04
Genotyping of Sea Anemone during Early Development
Published on: May 13, 2019
5.7K
螺的性别确定在头足动物中是独一无二的
Héctor Torrado1, Carlos Leiva2, Ana Riesgo3
1Marine Laboratory, University of Guam, UOG Station, 303 University Drive, Mangilao, GU 96923, USA.
Current biology : CB
|August 15, 2025
概括
头足动物的性别决定是多样化的. 状体利用XX/XY系统,挑战之前的ZZ/Z0假设,并揭示与男性生殖相关的Y染色体.
科学领域:
- 进化生物学 进化生物学
- 遗传学 是一个遗传学.
- 动物学 动物学
背景情况:
- 性别决定机制在动物分类中存在很大差异,并且可以快速演变.
- 以前人们认为头足动物拥有ZZ/Z0的性别确定系统,这种系统已经保存了4.8亿多年.
- 螺类,一个分离的头足类,提供了一个独特的机会来研究古代的性别确定系统.
研究的目的:
- 为了研究Nautiloidea的性别确定系统,一个分离的头足类.
- 重新评估以前关于头足动物性别决定机制的假设.
- 确定螺动物性决定的遗传基础和进化史.
主要方法:
- 结合表型性数据与多个基因组数据集 (已发表的基因组,低覆盖的全基因组,RAD-seq).
- 分析了Nautiloidea类中的9个种群中的6个物种的数据.
- 利用贝叶斯分析,基因组覆盖率比较和异构性水平来识别性别染色体.
主要成果:
- 螺类动物表现出XX/XY性别确定系统,雌性为同性,雄性为异性.
- 染色体#4被确定为X染色体,反驳了之前的ZZ/Z0系统建议.
- 确定了5个代表假定Y染色体的支架,包含36个基因,其中30个与男性生殖功能有关.
结论:
- 这项研究驳斥了螺动物的ZZ/Z0性别确定系统,而是提出了XX/XY系统.
- 这些发现突显了动物的性别确定系统的显著多样性和快速变化.
- 鉴定到的Y染色体及其相关基因为头足动物和双胞胎的雄性生殖进化提供了洞察力.
相关概念视频
02:45The Ratio of X Chromosome to Autosomes
8.8K
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
8.8K
01:20Mate Choice
10.4K
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
10.4K
02:50Dosage Compensation
6.3K
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...
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...
6.3K
01:23Red Algae
134
Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
134
01:06Fixed Action Patterns
16.5K
A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
16.5K