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Heterogametic means the two sex chromosomes of the organism are different (XY) whereas homogametic means that the two sex chromosomes of the organism are the same (XX).

Heterogametic sex is the sex that produces two different gametes, while the homogametic sex is the sex that produces identical gametes.
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*when fusing gametes are morphologically similar
*it is produced in some algae and fungus
*eg rhizopus

*when fusing gametes are morphologically distict
*they are produced in majority of sexually reproducing organisms
*eg fucus
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