EVERYDAY SCIENCE

SCIENCE

CELL BIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is one half or one rod of the condensed chromatin called?
A
DNA
B
chromatin
C
chromatid
D
chromosome
Explanation: 

Detailed explanation-1: -A chromatid is one of the two identical halves of a chromosome that has been replicated in preparation for cell division. The two “sister” chromatids are joined at a constricted region of the chromosome called the centromere.

Detailed explanation-2: -During prophase, the threadlike chromatin in the cell’s nucleus begins to condense into tiny rods. Scientists call each doubled rod of condensed chromatin a chromosome. Each identicalrod, or strand, of the chromosome is called a chromatid. The two strands are held together by a structure called a centromere.

Detailed explanation-3: -A sister chromatid refers to the identical copies (chromatids) formed by the DNA replication of a chromosome, with both copies joined together by a common centromere. In other words, a sister chromatid may also be said to be ‘one-half’ of the duplicated chromosome. A pair of sister chromatids is called a dyad.

Detailed explanation-4: -Chromatin exists in two forms. One form, called euchromatin, is less condensed and can be transcribed. The second form, called heterochromatin, is highly condensed and is typically not transcribed.

Detailed explanation-5: -A chromosome is a thread-like structure that is composed of DNA and protein. It carries all the genetic materials of an organism. This is passed from parent to offspring. Chromatid is one of the halves of a chromosome. A chromosome contains only one chromatid.

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