Tetrad Dissection
Tetrad Dissection - Related Videos
10:18
Dissection of Organs from the Adult Zebrafish
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Cited by 167 •
2010
This protocol describes a procedure for identifying and dissecting organs from the adult zebrafish.
07:40
Dissection of the Adult Zebrafish Kidney
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Cited by 38 •
2011
The zebrafish kidney is home to both renal and hematopoietic adult stem/progenitor cells, and represents an outstanding opportunity to study these cell types and their progeny in a vertebrate model organism. Here, we demonstrate a detailed dissection procedure that enables the researcher to identify and surgically remove the adult zebrafish kidney, which can be used for applications such as cell isolation, transplantation, and expression studies of kidney and/or blood cell populations.
06:42
Drosophila Larval NMJ Dissection
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Cited by 115 •
2009
This protocol demonstrates how to dissect Drosophila larvae in preparation for immunohistochemistry and/or imaging of the neuromuscular junction.
12:57
Dissection of Saccharomyces Cerevisiae Asci
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Cited by 8 •
2009
Micromanipulation of yeast cells is needed for meiotic genetic analysis or to select diploid zygotes. These micromanipulations are carried out using the microneedle of a dissection microscope. The microneedle is used to relocate cells and is controlled by a micromanipulator which are available with various degrees of automation.
04:41
Whole Vitreous Humor Dissection for Vitreodynamic Analysis
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2015
The goal of this protocol is to show an effective technique to isolate whole, intact vitreous core and cortex from post mortem enucleated porcine eyes.
FAQs
Because the four products remain associated with one meiotic event, their traits can be compared as a matched set rather than as unrelated cells. This allows researchers to determine how alleles segregated among the haploid spores and identify inheritance patterns within one ascus. The observations provide direct evidence about meiotic behavior at the individual-spore level.
Linkage and crossing over are inferred by examining how alleles are distributed across the four spores. Consistent co-segregation of alleles supports linkage, whereas new allele combinations indicate recombination associated with crossing over. Since the spores originate from the same meiotic event, these patterns can be related directly to the segregation behavior of that event.
Analyzing all four haploid products connects observed traits with the outcome of one complete meiotic event. This perspective helps researchers examine inheritance patterns and chromosome behavior without treating the products as an undifferentiated population. Consequently, tetrad analysis can provide direct evidence for meiotic mechanisms and reveal recombination patterns that support genetic interpretation.
The micromanipulator enables precise handling of the spores within an ascus. Researchers use it to remove the spores and place them separately on growth medium, preserving the identity of each meiotic product. This separation is essential because later colony traits must be assigned to individual spores before researchers compare inheritance and recombination patterns.
After the spores are removed from the ascus, each one is placed separately on growth medium. Individual spores then develop into genetically distinct colonies, creating physically separated material for comparison. Researchers examine the traits of those colonies together to identify allele segregation, linkage, crossing over, and recombination associated with the original meiotic event.
Tetrad dissection supports genetic mapping, mutant analysis, and studies of chromosome behavior. By comparing traits among colonies derived from individual spores, researchers can connect phenotypic differences with allele segregation and recombination patterns. In fungi such as yeast, this makes the technique useful for investigating how meiotic events produce genetically distinct haploid products.