In which generation is a recessive deleterious allele MOST likely to negatively affect the fitness of the individual expressing it?

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In plants, the gametophyte generation is haploid, meaning it has a single set of chromosomes. A recessive deleterious allele is more likely to be expressed and negatively affect the fitness of the individual in this generation because there is no dominant allele to mask its effects, unlike in the diploid sporophyte generation where two sets of chromosomes are present.

In Which Generation Is a Recessive Deleterious Allele MOST Likely