In a mendelian monohybrid cross, which generation is always completely heterozygous?

F_{1}

generation

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F_{2}

generation

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F_{3}

generation

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None of the above

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Solution

The correct option is A $F_{1}$ generation
One parent is homozygous for one allele and the other parent is homozygous for the other allele, the offspring of the first filial generation, every member of this generation is heterozygous and the phenotype expresses the dominant trait.
So, the correct option is 'F$_1$ generation'.

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