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Kalahira
The term that is used to refer to the condition wherein the organism has an extra chromosome than normal is polysomy. Thus, the answer to this item is letter B. Polysomy is found in many species including mammals, insects, plants, fungi, etc. In this condition, there may be two or more copies of chrosomes rather than two.
W0lf93
Presence of one extra chromosome is called as polysomy. It may occur due to chromosomal non disnjunction during meiosis. Many abnormalities occur in such cases, depending upon which chromosome is presnt in duplicates. It may cause mental r etardation, physical, developmental abnormalities, as well as social/psychiatric difficulties.

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