What are Y STR values?

Asked By: Blasina Itxaso | Last Updated: 18th March, 2020
Category: science genetics
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The numbers and letters in the Y-DNA – Standard Y-STR Values page are the results for your Y-chromosome DNA STR tests. The first row is the locus number in the test panel. For example, for the first panel (Y-DNA12 results) each locus is numbered 1 through 12. The second row is the scientific name of each STR tested.

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Similarly, you may ask, what is Y STR testing?

Y-STR. Y- STRs are Short Tandem Repeats (STRs, refer to the STR page for more details) found on the male-specific Y Chromosome. Y-STRs have been used by forensic laboratories to examine sexual assault evidence. In a sexual assault case, evidence such as vaginal swabs will contain both female and male DNA.

One may also ask, what makes Y STRs useful in forensic sciences? A Y-STR is a short tandem repeat (STR) on the Y-chromosome. Y-STRs are often used in forensics, paternity, and genealogical DNA testing. Autosomal STRs provide a much stronger analytical power because of the random matching that occurs between pairs of chromosomes during the zygote making process.

People also ask, what are Y STR markers?

A Y-STR is a short tandem repeat (STR) on the Y chromosome. Y-STRs are usually designated by DYS numbers. The standard Y-chromosome (Y-DNA) test used for genealogical purposes looks at differing numbers of Y-STRs, collloquially known as markers. The combination of Y-STRs tested is known as a haplotype.

What does Y DNA tell you?

A Y chromosome DNA test (Y-DNA test) is a genealogical DNA test which is used to explore a man's patrilineal or direct father's-line ancestry. The Y chromosome, like the patrilineal surname, passes down virtually unchanged from father to son.

34 Related Question Answers Found

What is an str?

A short tandem repeat (STR) in DNA occurs when a pattern of two or more nucleotides are repeated and the repeated sequences are directly adjacent to each other. An STR is also known as a microsatellite.

What is Y chromosome analysis?

Y chromosome analysis is a useful technique for analysing DNA that can be likened in one sense to studying male surnames. Think about the way that male surnames are passed down from one generation to another and continue on through sons. This mechanism is a simplistic representation of Y chromosomes.

How do you do STR analysis?

Performing STR Analysis
STR analysis involves the extraction of nuclear DNA from cells in a sample. Certain regions of the DNA that are extracted are then amplified by the polymerase chain reaction. After amplification, a scientist performs gel electrophoresis to find out how many repeats of the STR sequence exist.

What is autosomal STR?

What is Autosomal DNA Profiling? STRs are short fragments of DNA, usually 2 to 6 base pairs in length which are repeated over and over again in a defined location of the autosomal DNA. The length of the repeat can vary from person to person, and is inherited within the Autosomal chromosome.

Can you get DNA from skin?


Touch DNA. It is called "touch DNA" because it only requires very small samples, for example from the skin cells left on an object after it has been touched or casually handled, or from footprints. Touch DNA analysis only requires seven or eight cells from the outermost layer of human skin.

Why are Y chromosomes and DNA useful in DNA fingerprinting?

A Y-chromosomal gene fragment is applied for inferring the biological sex of a crime scene trace donor. Y-chromosome polymorphisms are applied for inferring the paternal bio-geographic ancestry of unknown trace donors or missing persons, in cases where autosomal DNA profiling is uninformative.

What is dys391?

STR's occur at specific locations on the y-chromosome, which are often referred to as loci, and are given names such as "DYS391." STR's occur when short segments of DNA sequences get repeated over and over along a portion of a chromosome. For example, DYS391 consists of repeats of the base sequence -GATA-.

How many chromosomes do humans have?

How many chromosomes do people have? In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the sex chromosomes, differ between males and females.

How does mitochondrial DNA testing work?

A mitochondrial DNA test (mtDNA test) traces a person's matrilineal or mother-line ancestry using the DNA in his or her mitochondria. mtDNA is passed down by the mother unchanged, to all her children, both male and female. A mitochondrial DNA test, can therefore be taken by both men and women.

What is the purpose of codis?


The Combined DNA Index System, or CODIS, blends forensic science and computer technology into a tool for linking violent crimes. It enables federal, state, and local forensic laboratories to exchange and compare DNA profiles electronically, thereby linking serial violent crimes to each other and to known offenders.

What is a haplogroup marker?

From ISOGG Wiki
A haplogroup is a genetic population group of people who share a common ancestor on the patriline or the matriline. Haplogroups are assigned letters of the alphabet, and refinements consist of additional number and letter combinations.

Why are strs used in DNA profiling?

STR analysis is a tool in forensic analysis that evaluates specific STR regions found on nuclear DNA. These STR loci (locations on a chromosome) are targeted with sequence-specific primers and amplified using PCR. The DNA fragments that result are then separated and detected using electrophoresis.

How convincing is a matching Y chromosome profile?

Y-chromosome profiles are valuable when there is a mixture of male-source and female-source DNA, and interest centres on the identity of the male source(s) of the DNA. The problem of evaluating evidential weight is even more challenging for Y profiles than for autosomal profiles.

What is VNTR used for?

VNTR analysis is also being used to study genetic diversity and breeding patterns in populations of wild or domesticated animals. As such, VNTRs can be used to distinguish strains of bacterial pathogens. In this microbial forensics context, such assays are usually called Multiple Loci VNTR Analysis or MLVA.

What are short tandem repeats and why are they important?


The number of repeats in STR markers can be highly variable among individuals, which make these STRs effective for human identification purposes. For human identification purposes, it is important to have DNA markers that exhibit the highest possible variation in order to discriminate between samples.

Why are short tandem repeats used in DNA profiling?

One of the current techniques for DNA profiling uses polymorphisms called short tandem repeats. Short tandem repeats (or STRs) are regions of non-coding DNA that contain repeats of the same nucleotide sequence. For example, GATAGATAGATAGATAGATAGATA is an STR where the nucleotide sequence GATA is repeated six times.

Is DNA profiling and DNA fingerprinting the same?

DNA profiling (also called DNA fingerprinting) is the process of determining an individual's DNA characteristics. DNA analysis intended to identify a species, rather than an individual, is called DNA barcoding.