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Related Concept Videos

Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
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Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
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There are many research methods available to psychologists in their efforts to understand, describe, and explain behavior and the cognitive and biological processes that underlie it.
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
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Polytene Chromosomes02:04

Polytene Chromosomes

Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...
Behavioral Genetics and Its Designs01:23

Behavioral Genetics and Its Designs

Behavior genetics explores how genetic inheritance influences human behavior. It focuses on how genes, passed from parents to offspring, contribute to the development of behavioral traits and tendencies. This branch of genetics seeks to understand the complex interplay between inherited genetic factors and environmental influences in shaping our behaviors.
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Related Experiment Video

Updated: Jun 24, 2026

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
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Published on: September 5, 2011

Morphological and cytogenetic studies on conjoined twins.

B Konstantinova

    Acta Geneticae Medicae Et Gemellologiae
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    This report details two cases of monoamniotic conjoined male twins, highlighting complex anatomical abnormalities and genetic variations. The findings offer insights into the developmental challenges of conjoined twins.

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    Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
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    Published on: September 5, 2011

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    Published on: September 8, 2023

    Area of Science:

    • Medical Genetics
    • Developmental Biology
    • Teratology

    Background:

    • Monoamniotic conjoined twins, though rare, present significant challenges in prenatal diagnosis and management.
    • Understanding the spectrum of anomalies in conjoined twins is crucial for improving outcomes.

    Observation:

    • Case 1: Bicephalus twin with hypoplastic left-sided organs, absent left umbilical artery, and two communicating hearts.
    • Case 2: Pygothoracopagus twin with a parasitic component, exhibiting craniofacial and limb malformations.
    • Detailed examination revealed significant asymmetry in organ development and the presence of a rudimentary second mouth and double eye in the formed twin.

    Findings:

    • The umbilical cord in the pygothoracopagus case contained five vessels: one umbilical vein and four umbilical arteries.
    • Cytogenetic analysis of the pygothoracopagus demonstrated aneuploidy, with greater severity in the parasitic twin.

    Implications:

    • These cases underscore the complex interplay of genetic and developmental factors in conjoined twinning.
    • Further research into the genetic underpinnings of conjoined twin malformations is warranted.
    • Improved understanding can aid in more accurate prognostication and potential interventions.