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01:27Development of the Heart
The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart tube by...
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart tube by...
01:21Nondisjunction
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...
01:29Nondisjunction
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.
01:07Teratogenicity
The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
02:07Oogenesis
In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
01:19Autism Spectrum Disorder
Autism spectrum disorder (ASD) is a neurodevelopmental condition marked by persistent deficits in social communication and interaction alongside restrictive and repetitive behaviors or interests. ASD is sometimes accompanied by intellectual impairment.
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.
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Updated: Jul 12, 2026
05:51
A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
Published on: June 15, 2011
Resumen
Las anomalías científicas a menudo se reconocen solo después de que las nuevas teorías las explican, revelando un fenómeno de "retroreconocimiento". Esto pone de relieve aspectos clave del descubrimiento científico y la psicología humana.
Área de la Ciencia:
- Filosofía de la Ciencia Filosofía de la Ciencia
- Psicología Cognitiva Psicología cognitiva.
- Historia de la Ciencia Historia de la Ciencia
Sus antecedentes:
- Las anomalías científicas desafían las teorías existentes.
- Las anomalías pueden impulsar el progreso científico y los cambios de paradigma.
Objetivo del estudio:
- Para explorar el fenómeno de
- retroreconocimiento de retroreconocimiento.
- en el descubrimiento científico.
- Analizar cómo se identifican las anomalías e integrarlas en nuevos marcos conceptuales.
Principales métodos:
- Análisis conceptual de los procesos de descubrimiento científico.
- Examen de los estudios de casos científicos históricos.
- Análisis psicológico de los sesgos cognitivos en la interpretación científica.
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Principales resultados:
- Las anomalías a menudo se reconocen retrospectivamente, una vez explicadas por una nueva teoría.
- La identificación de anomalías está influenciada por el marco teórico prevaleciente.
- Esta retroreconocimiento pone de relieve la interacción entre la observación, la teoría y los factores psicológicos.
Conclusiones:
- El reconocimiento de las anomalías científicas no siempre es inmediato, pero puede ser retrospectivo.
- El proceso de descubrimiento científico implica elementos psicológicos que influyen en la interpretación de los datos.
- Comprender la retrorecognición ofrece información sobre el cambio teórico y los procesos cognitivos en la ciencia.