Chromosome, DNA and gene — task. Science State Board, Class 10.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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Find out, whether the given statement is true or false and give justification for the same:

1. The number, size, and shape of chromosomes in an organism's cell nucleus is called a phenotype of chromosome.

This statement is

Phenotype of chromosome refers to the external appearance of the cell organelle.
The number, size, and shape of chromosomes in an organism's cell nucleus is called a karyotype.

2. The pairing of nitrogenous bases is quite specific. It always occurs between purine and pyrimidine, which are joined together by nitrogen bonds.

This statement is

The pairing of nitrogenous bases always occurs between purine and pyrimidine, which are joined together by hydrogen bonds.
Thymine (T) is linked to Adenine (A) via two nitrogen bonds (A = T). Guanine (G) is linked to Cytosine (C) by three nitrogen bonds (C ≡ G).

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20. Chromosome, DNA and gene