Question

81. Choose the correct one for the chromosome given
below:
(a) It is with one chromatid and one molecule of
dsDNA
(b) It is with two chromatids and two molecules of
dsDNA
(c) It is with two chromatids and two arms
(d) It is one arm and two chromatids​

Answer 1

Answer:

it is with one chromatid and one molecule of DNA

Answer 2

Answer:

One chromosome consists two chromatids and two molecules of

dsDNA.

Therefore, option (b) is correct.

Explanation:

DNA molecule is packaged into thread-like structures in the nucleus of each cell is called chromosome.

• All living organisms posses chromosomes while human body contains 23 pairs of chromosomes. 22 pairs of these chromosomes are identical in males and females are called autosomes.
• The 23rd pair of chromosomes differ between the sexes, are called allosomes.  Females have one pair of the “X” chromosome while males have one “X” and “Y” chromosome, while males have one “X” or “Y” chromosome.
• A chromatid is one of the two similar halves of a chromosome that replicated at the time of cell division. The two identical chromatids are joined at the region of the chromosome is called centromere.
• One Chromatid contains one molecule of  double stranded DNA. Each chromosome have two chromatids.
• Therefore, each chromosome will contain two molecules of double stranded DNA.

To know more about "Pairing of chromosome"

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