MCQ
Chromosome complement with 2n − 1 is called as
- AMonosomy
- BNullisomy
- CTrisomy
- DTetrasomy
Explanation:
Monosomy is absence of a single chromosome from a diploid cell (2n - 1). Nullisomy is absence of one complete pair of homologous chromosomes (2n - 2). Presence of one chromosome four times is called tetrasomy (2n + 2). A diploid cell with an extra chromosome is trisomic (2n + 1).
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$I.$ A soil inhabiting plant bacterium, Agrobacteriumtumefaciens, a pathogen of several dicot plants is able to transfer a piece of $DNA$ known as $T-DNA$
$II.$ The T-DNA causes tumours
$III.$ Tumour formation induced by $Ti-$ plasmid
Which of the statements given above are correct?
Reason : Haemophilia occurs due to mutation of a structural gene on chromosome $15$.