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Karyotyping

Karyotyping

Chromosomal Theory of Inheritance

Chromosomal Theory of Inheritance

In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”

Karyotyping

Karyotyping

Lampbrush Chromosomes

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.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...

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...

Lampbrush Chromosomes

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.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...

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Updated: May 8, 2026

Spectral Karyotyping to Study Chromosome Abnormalities in Humans and Mice with Polycystic Kidney Disease

Spectral Karyotyping to Study Chromosome Abnormalities in Humans and Mice with Polycystic Kidney Disease

Published on: February 3, 2012

Barbara McClintock and Cytogenetics.

J V Pai-Dhungat¹

¹Professor (Retired), Department of Medicine, Topiwala National Medical College and Bai Yamunabai Laxman Nair Charitable Hospital; Honorable Physician, Bhatia Hospital, Mumbai, Maharashtra, India.

The Journal of the Association of Physicians of India

|February 10, 2025

Summary

This summary is machine-generated.

Pioneering geneticist Barbara McClintock identified maize chromosomes using microscopy, launching the new science of cytogenetics. Her early work in plant breeding involved detailed chromosomal analysis.

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Area of Science:

Genetics
Cytology
Botany

Background:

Barbara McClintock pursued genetics at Cornell's College of Agriculture.
Her research focused on maize genetics within the botany department.

Purpose of the Study:

To investigate maize chromosomes through microscopic identification.
To establish the foundation for the new science of cytogenetics.

Main Methods:

Utilized microscopy to identify individual maize chromosomes.
Applied new staining techniques for cytological studies.
Focused on the most suitable embryo parts for analysis.

Main Results:

Successfully identified the 10 chromosomes of maize.
Laid the groundwork for cytogenetics through detailed chromosomal analysis.
Enabled advancements in plant breeding experiments.

Conclusions:

McClintock's innovative methods established cytogenetics as a distinct scientific field.
Her early research significantly contributed to the understanding of plant genetics and breeding.