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B
Fusion of gametes
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C
Formation of zygote
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D
Formation of gonads
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Solution
The correct option is A Formation of gametes Mendel's law of segregation states that allele pairs separate or segregate during gamete formation and randomly unite at fertilization. Organisms inherit two alleles for each trait. When gametes are produced by meiosis, allele pairs separate leaving each cell with a single allele for each trait. When the two alleles of a pair are different, one is dominant and the other is recessive.