2. Certain varieties of chrysanthemums contain 18, 36, 54, 72 and 90 chromosomes. How would you describe these varieties genetically? A variety with 27 chromosomes has been discovered, but it is sterile, why?
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Each individual/species has chromsomes in their cells and this chromsome number remains constant for a particular species.
Eg.
c
The chromosome number in humans is 46.
The chromosome number in rice is 24.
In biology, the set of chromosomes is referred as ploidy.
If a species has two sets of chromsomes they are referred as diploids. Eg. Humans.
In some cases some species have more than two sets of chromosomes, such are referred as polyploids. Eg. potato, wheat, tobacco etc.
Some species exhibit more than one type of polyploid status. Eg. Brasica.
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