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Unformatted text preview: oxygen stress. Achondroplasia Achondroplasia, a form of dwarfism, has a prevalence of one case in 25,000 people. o Heterozygous individuals have the dwarf phenotype. o The 99.99% of the population who are not achondroplastic dwarfs are homozygous recessive for this trait. o Achondroplasia is another example of a trait for which the recessive allele is far more prevalent than the dominant allele. Lethal dominant alleles are much less common than lethal recessive alleles. o If a lethal dominant allele kills an offspring before he or she can mature and reproduce, the allele will not be passed on to future generations. o In contrast, a lethal recessive allele can be passed on by heterozygous carriers who have normal phenotypes....
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