Definition of polytene : relating to, being, or having chromosomes each of which consists of many strands with the corresponding chromomeres in contact.
What is heterochromatin and euchromatin?
Heterochromatin is defined as the area of the chromosome which is darkly stained with a DNA specific stain and is in comparatively condensed form. Euchromatin is defined as the area of the chromosome which is rich in gene concentration and actively participates in the transcription process.
What is the function of polytene chromosome?
Polytene chromosomes, at interphase, are seen to have distinct thick and thin banding patterns. These patterns were originally used to help map chromosomes, identify small chromosome mutations, and in taxonomic identification. They are now used to study the function of genes in transcription.
What is a polytene chromosome?
Polytene chromosomes develop from the chromosomes of diploid nuclei by successive duplication of each chromosomal element (chromatid) without their segregation. The newly formed chromatids remain associated lengthwise and together form a cable-like structure, referred to as polytene chromosomes.
What do you mean by Endomitosis?
Definition of endomitosis : division of chromosomes not followed by nuclear division that results in an increased number of chromosomes in the cell.
What is salivary chromosome?
Definition of salivary chromosome : one of the very large polytene chromosomal strands made up of many chromatids that are typical of the salivary gland cells of various insects.
How many chromosomes are in a human?
46
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.
What is the difference between DNA and chromosomes?
A chromosome is a long chain of DNA molecules that contains part of all of the genetic material of an organism. DNA is a fundamental molecule that carries the genetic instruction of all living organisms. DNA is packed into chromosomes with the help of special proteins called histones.
What does with politeness mean?
Politeness is defined as behaving in a socially acceptable way with proper manners and etiquette. When you stand up to greet guests as they enter a room and you keep your elbows off the table during dinner, this is an example of politeness.
How important is politeness to you?
Politeness is an important skill that will make us achieve our objectives in life as people will always take us seriously and deal with us in the right way. Showing politeness to other people enlightens and brightens their day, this can be essential if we are to achieve our objectives at an individual or organizational level.
What is courtesy and politeness?
As nouns the difference between courtesy and politeness is that courtesy is (uncountable) polite behavior while politeness is the quality of being polite . As a verb courtesy is . As an adjective courtesy is given or done as a polite gesture.
