Chromosome number is

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(A) The chromosome number is a characteristic feature that remains fixed for a particular species.Each species has a specific and constant number of c

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Fixed for a species

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(A) The chromosome number is a characteristic feature that remains fixed for a particular species.Each species has a specific and constant number of chromosomes in its somatic cells.For example, the lowest chromosome number is seen in $Haplopappas 	ext{ } gracilis$ $(2n = 4)$, while the maximum number is found in $Ophioglossum$ species ($2n = 1262$ or up to $1656$ depending on the variety).Therefore, the correct option is $A$.

Chromosomes	Position of centromere
$A$. Metacentric	$1$. At the tip
$B$. Submetacentric	$2$. Almost near the tip
$C$. Acrocentric	$3$. At the middle
$D$. Telocentric	$4$. Slightly away from the middle

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Chromosomes Position of centromere

$A$. Metacentric $1$. At the tip

$B$. Submetacentric $2$. Almost near the tip

$C$. Acrocentric $3$. At the middle

$D$. Telocentric $4$. Slightly away from the middle

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