In a randomly mating laboratory population of Drosophila, 4 per cent of the flies have black bodies (black is autosomal recessive, b) and 96 per cent have brown bodies (normal colour, B). If this population is assumed to be in Hardy-Weinberg equilibrium, what are the allelic frequencies of B and b, and the genotypic frequencies of BB and Bb?

In a randomly mating laboratory population of Drosophila, the trait for body color is determined by a gene with two alleles: B (brown body color) and b (black body color). The black body color is autosomal recessive, meaning that an individual will have a black body only if it inherits two copies of the b allele (genotype bb). The normal brown body color is dominant, and an individual with either a homozygous dominant ___ ______ ________ _______ ________ ________ _________ _____ ____ ___ _________.
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