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Chromatin, Chromatid, Chromsome Terminology

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#1 001xman001



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Posted 02 April 2009 - 05:04 PM

Some Questions to which I have found different/conflicting answers depending on what I have read or who I have talked to. Thanks in Advance.

1-Chromatin, chromosomes, and chromatid all consist of DNA AND some sort of proteins?
2-Is the following statement accurate: ALL types/forms of chromatin material and chromatids consist of chromosomes BUT not all types of chromosomes are chromatin or chromatids?
3-An unreplicated chromosome consists of a single strand of DNA?
4-An unreplicated chromosome is considered a chromosome, but are two sister chromatids attached by a centromere considered a SINGLE chromosome or TWO chromosomes?
5-Chromatid refers to a SINGLE chromosome/DNA strand in the complex of the two DNA strands/chromosomes which are attached? Can the whole complex be considered A chromatid or TWO chromatids; do you use the term sister CHROMATID or CHROMATIDS to describe the entire structure?
6-The term chromatid(s) is ONLY appropriate when two DNA strands/chromosomes are attached at the centromere?
7-When cells are not replicating, the DNA is still in chromosome form. However it is very loose and hard to see. Is the term chromatin used for a SINGLE stretched out chromosome or ALL stretched chromosomes?
8-Can the term homologous chromosomes be used to describe the two chromosomes joined by a centromere? Can the term homologous chromosomes be used to describe the two copies (i.e. two strands) of chromosome 1 that a human carries?
9-In a human male, can you consider the X and Y chromosomes to be homologous OR can you only consider the X chromosome to be homologous when it is attached to its sister chromatid during mitosis/meiosis?
10-There are two centromeres and two kinetechores for sister chromatids. However there is one centromere region?

#2 bob1


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Posted 05 April 2009 - 05:32 PM

So what answers make sense to you? Have you tried your text book? They are pretty reliable usually.

#3 chromatin



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Posted 09 April 2009 - 04:56 AM

You need one good textbook with nice figures.

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