Cri-du-chat syndrome in humans is caused by the
Cri-du-chat syndrome in humans is caused by the
- [AIPMT 2006]
- A
trisomy of $21^{st}$ chromosome
- B
fertilization of an $XX$ egg by a normal $Y$-bearing sperm
- C
loss of half of the short arm of chromosome $5$
- D
loss of half of the long arm of chromosome $5$
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Polytene chromosomes were first observed by
Polytene chromosomes were first observed by
- [AIIMS 1985]
The total number of nitrogenous bases in human genome is estimated to be about
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- [AIIMS 2004]
Few genes are found in all types cells of differentiated multicellular organisms of high class. It is called
Few genes are found in all types cells of differentiated multicellular organisms of high class. It is called
In eukaryotes, the $RNA$ polymerase that synthesises $tRNA$ is $RNA$ polymerase ______ and is also responsible for formation of ______ $rRNA$.
In eukaryotes, the $RNA$ polymerase that synthesises $tRNA$ is $RNA$ polymerase ______ and is also responsible for formation of ______ $rRNA$.
If a certain group of cells utilise the amino acid glycine exclusively for protein synthesis, and if a growing culture of these cells is fed radioactive glycine, radioactivity will be found first in the
If a certain group of cells utilise the amino acid glycine exclusively for protein synthesis, and if a growing culture of these cells is fed radioactive glycine, radioactivity will be found first in the