Polytene chromosome

(A) Chromosome 22, one of the smallest human chromosomes, contains 48 × 106 nucleotide pairs and makes up approximately 1.5% of the entire human genome. Most of the left arm of chromosome 22 consists of short repeated sequences of DNA that are packaged in a particularly compact form of chromatin (heterochromatin), which is discussed later in this chapter. (B) A tenfold expansion of a portion of chromosome 22, with about 40 genes indicated. Those in dark brown are known genes and those in…

Drosophila polytene chromosomes are formed by repeated rounds of DNA replication without cell division.

I had someone ask whether, in a previous post, I meant universal common descent (UCD) or more limited common descent.

Polytene chromosomes are large chromosomes which have thousands of DNA strands. They provide a high level of function in certain tissues such as salivary glands of insects.

Some cells at particular stages contain large nuclei with giant or large sized chromosomes . The giant chromosomes are the Polytene and...

Polytene Chromosome from Drosophilia

Nucleus (Nucleus was first described by Robert Brown in 1831, and it's material stained by the basic dyes was given the name chromatin by Flemming.)

Band of Sisters Chromosomes in the Drosophila salivary gland undergo replication without separation of sister chromatids, forming giant polytene chromosomes. These chromosomes have clear banding patterns and allow exquisite visualization of specific genetic regions. Image: Drosophila polytene chromosome of the third instar salivary gland stained with DAPI (blue) and antibodies directed against gypsy chromatin insulator proteins Su(Hw) (green) and Mod(mdg4)2.2 (red).

Today is #WorldDownSyndromeDay! ❤️ Down syndrome occurs when there’s an extra copy of chromosome 21, instead of the usual two. This is called trisomy 21. These thread-like structures are your chromosomes, containing all of your genetic information, usually one from each parent. This paired arrangement is called a karyotype, and organizes your chromosomes by size and shape, offering a snapshot of your genetic makeup. ⁣ People with Down syndrome have an extra dose of genetic information…

The position on a CHROMOSOME where it separates during cell division; a structure of noncoding DNA (DNA that does not convey genetic information)When the cell divides the strands of the chromatids migrate in opposite directions (pull apart) at the centromere. In a photomicrograph, the centromere appears as an indented, waistlike area on the chromosome. Geneticists use the centromere’s position, along with other chtrstcs of the chromosome, to match them into their pairs when creating…

ChiTaRS – largest ever database of chimeric RNAs - Scientists from the Spanish National Cancer Research Centre’s Structural Computational Biology Group, led by Alfonso Valencia, are making the largest ever catalogue of biological chimeras available to the public domain. Specifically, the new database comprises a c ollection of more than 29,000 small RNA molecules–those envolved in making proteins–that originate from different genomic regions. These molecules, the so-called chimeric RNAs...

Polytene chromosome - Wikipedia

A chromosome disorder results from a change in the number or structure of chromosomes.

Download the Types of Chromosomes in relation to the centromere location 7508619 royalty-free Vector from Vecteezy for your project and explore over a million other vectors, icons and clipart graphics!

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Illustration about Unduplicated and Duplicated Chromosomes. Sister Chromatids. Vector illustration. Illustration of division, health, chromatin - 134919648

polytene vs normal chromosome Griffiths - Google Search