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B
Isogamy
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C
Allogamy
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D
Dichogamy
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Solution
The correct option is B Allogamy
Autogamy is the fusion of 2 different types of gametes that are from the same individual. Though, genetically they are similar as they're from the same individual.
Isogamy is the fusion of gametes that are similar.
Allogamy is the fusion of two different types of gametes between two different individuals. This term is commonly used for plants. These gametes are dissimilar genetically too.
Dichogamy is the production of male and female reproductive elements at different times by a bisexual organism in order to ensure cross-fertilization.