Questions tagged [karyotype]

The number and morphology of chromosomes in eukaryotic nuclei and analyses related to measuring the karyotype.

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Infestation of Unknown Origin, Type, and Purpose

This bug infested my daughter’s car and she’s been hoping someone can tell her what it is and why it was attracted to her car. (https://i.stack.imgur.com/TNRmM.jpg)
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number of chromatids seen in karyotype

The karyotype is performed on a cell whose cycle has been stopped in metaphase or pro metaphase, using colchicine or by other means. In the textbooks I read that during the S phase each of the 46 ...
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151 views

Karyotypes Appearance

Most actual karyotypes online appear as single chromosomes (unreplicated). I was under the impression that a micrograph of the replicated chromosomes was taken during metaphase of mitosis and thus ...
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127 views

Polymorphism in number of chromosomes?

The answer to this question, saying that Down Syndrome - a trisomy of human chromosome 21 - is caused by de novo mutation (rather than resulting from standing variation) made me think about ...
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What are homologous chromosomes?

I've read that homologous chromosomes are composed of one maternal chromosome and one paternal chromosome. I want to confirm if this image is for one set of homologous chromosomes: They have the ...
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230 views

Understanding a Chromosomal formula in a karytope analysis

I am reading a medical reporting results of a karyotype analysis. On it it is written: Chromosomal formula 46,XX,del(7)(q11q36)[12]/46,XX[13] I understand that ...
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166 views

Why does this karyotype start numbering at 11?

Here is some image I found for karyotyping a chromosome: Why does the band numbering start at 11? When I count other things I usually start with the number one, and in some cases zero. Eleven seems ...
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768 views

Why does size decrease across the sequence of human chromosomes?

The following graph shows a decrease in the number of base pairs per chromosome across the sequential set of human chromosomes: Is this because chromosomes were originally numbered by their size on ...
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Is there a karyotype database for human cell lines?

I'm looking for the karyotype of a specific cell line. Some karyotypes are well known, such as HeLa or some carcinomas, but some are very hard to find, such as LG2 (B cells). Is there a database ...