Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Nondisjunction

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.

Polytene Chromosomes

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...

The Ratio of X Chromosome to Autosomes

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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Implementation of a safety protocol for removal of bars in the pectus excavatum.

Cirugia pediatrica : organo oficial de la Sociedad Espanola de Cirugia Pediatrica·2026

Same author

Prenatally diagnosed segmental intestinal dilatation associated with anorectal malformation.

Cirugia pediatrica : organo oficial de la Sociedad Espanola de Cirugia Pediatrica·2024

Same author

Complications after Nuss bar removal procedure for pectus excavatum. Analysis and proposal of a safety protocol.

Cirugia pediatrica : organo oficial de la Sociedad Espanola de Cirugia Pediatrica·2024

Same author

Erratum.

The American naturalist·2018

Same author

POLYMORPHISM REGENERATION FOR A NEUTRALIZED SELFISH B CHROMOSOME.

Evolution; international journal of organic evolution·2017

Same author

A WIDESPREAD B CHROMOSOME POLYMORPHISM MAINTAINED WITHOUT APPARENT DRIVE.

Evolution; international journal of organic evolution·2017

Search research articles

Related Experiment Video

Updated: Jul 5, 2026

Light Sheet-based Fluorescence Microscopy of Living or Fixed and Stained Tribolium castaneum Embryos

Light Sheet-based Fluorescence Microscopy of Living or Fixed and Stained Tribolium castaneum Embryos

Published on: April 28, 2017

Accidental twins in a monembryonic insect.

J Cabrero, J P Camacho, F Pascual

|February 1, 1996

Summary

A grasshopper egg unusually contained two male embryos, each with a B chromosome, exhibiting delayed development but normal morphology. This finding prompts discussion on the mechanisms behind such twinning phenomena in insects.

Area of Science:

Entomology
Genetics
Developmental Biology

Background:

Twinning is a rare phenomenon in insects, particularly in species like the grasshopper Eyprepocnemis plorans.
The presence of B chromosomes can influence developmental processes and genetic stability in various organisms.

Purpose of the Study:

To document and analyze an unusual case of twinning in a grasshopper egg.
To investigate the developmental and morphological characteristics of twin embryos carrying a B chromosome.
To explore potential mechanisms underlying this rare occurrence.

Main Methods:

Microscopic examination of grasshopper egg contents.
Comparative analysis of twin embryo development against single embryos from the same egg pod.
Morphological assessment of embryo development.

More Related Videos

Injecting Gryllus bimaculatus Eggs

Injecting Gryllus bimaculatus Eggs

Published on: August 22, 2019

Delivery of Nucleic Acids through Embryo Microinjection in the Worldwide Agricultural Pest Insect, Ceratitis capitata

Delivery of Nucleic Acids through Embryo Microinjection in the Worldwide Agricultural Pest Insect, Ceratitis capitata

Published on: October 1, 2016

Related Experiment Videos

Last Updated: Jul 5, 2026

Light Sheet-based Fluorescence Microscopy of Living or Fixed and Stained Tribolium castaneum Embryos

Light Sheet-based Fluorescence Microscopy of Living or Fixed and Stained Tribolium castaneum Embryos

Published on: April 28, 2017

Injecting Gryllus bimaculatus Eggs

Injecting Gryllus bimaculatus Eggs

Published on: August 22, 2019

Delivery of Nucleic Acids through Embryo Microinjection in the Worldwide Agricultural Pest Insect, Ceratitis capitata

Delivery of Nucleic Acids through Embryo Microinjection in the Worldwide Agricultural Pest Insect, Ceratitis capitata

Published on: October 1, 2016

Main Results:

A single grasshopper egg contained two male embryos.
Both twin embryos possessed one B chromosome.
The development of these twin embryos was delayed compared to untwinned embryos from the same egg pod.
Despite developmental delay, the morphology of the twin embryos appeared normal.

Conclusions:

The presence of B chromosomes in twin grasshopper embryos may be linked to developmental delays.
This case highlights the complex interplay between twinning, B chromosomes, and embryonic development in insects.
Further research is needed to elucidate the precise mechanisms causing this unusual twinning event.