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Option 1 : i and iv only
The correct answer is I and IV only.
- A chromosome is an organized package of DNA found in the nucleus of the cell.
- Different organisms have different numbers of chromosomes.
- Humans have 23 pairs of chromosomes:
- 22 pairs of numbered chromosomes, called autosomes,
- one pair of allosomes (sex chromosomes), X and Y.
- The X and Y chromosomes determine the biological sex of an individual:
- females inherit an X chromosome from the father for a XX genotype,
- males inherit a Y chromosome from the father for an XY genotype (mothers only pass on X chromosomes).
- The autosomes contain the rest of the genetic hereditary information.
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