関連する実験動画
Updated: Jul 12, 2026

06:44
Induction and Evaluation of Inbreeding Crosses Using the Ant, Vollenhovia Emeryi
Published on: October 5, 2018
まとめ
ミツバチの労働者は,関係性に基づいて投資の性別比率を調整する. 姉妹がより密接な関係にある場合,作業者はより多くの女性を生成することを好み,eusocial Hymenopteraで包括的なフィットネスを最大化します.
科学分野:
- 進化生物学の進化生物学について
- 行動生態学は,行動生態学である.
- 社会的な昆虫 社会的な昆虫
背景:
- ハプロディプロイドのヒメノプテラの性別決定は,関係性の非対称性を生み出します.
- 親族選択と性比理論は,労働者による女性偏りのある投資を予測する.
研究 の 目的:
- 原始的な社会的なミツバチにおける性比バイアスの予測を実験的にテストするために.
- 労働者によるコロニーの性別比率の選択的調整を調査する.
主な方法:
- 鋳造女王を取り除くか,取り除くかによって,関係性非対称性の実験的操作.
- クイーンライトとクイーンレスコロニーの性比の比較 Augochlorella striata.
- 労働者の生殖のような代替説明を無視する.
主要な成果:
- クイーンライト・コロニー (関係性非対称性がある) は,より女性偏向の性比を生み出しました.
- 女王のないコロニー (関係性非対称性がない) は,女性偏りの少ない性別比率を生み出しました.
- 労働者は,関係性の非対称性に対応して,コロニーの性別比率を選択的に調整した.
結論:
- 労働者は投資を,親戚の多い姉妹に偏り,親戚の少ない兄弟から遠ざけた.
- 労働者の選択的な性比調整は,親族選択理論を支持する.
- 発見は,原始的な社会的な昆虫における性比の適応的操作を示しています.
関連する概念動画
The Ratio of X Chromosome to Autosomes
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 Drosophila...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Nondisjunction
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
Nondisjunction
During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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...
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...
Hardy-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,...
Formation of Species
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...

