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allele. one of two or more alternative forms of a gene at the same site or locus in each of a pair of chromosomes, which determine alternative characters in inheritance. Called also allelomorph. blank allele. an allele which produces an antigen which cannot be detected. null allele. see silent allele (below).
a pattern of inheritance resulting from the transmission of a recessive allele on an autosome. Males and females are usually affected with equal frequency.If both parents are heterozygous (Aa), each of their children has a 25% chance of expressing the trait of the recessive allele. pattern of inheritance resulting from the transmission of a recessive allele on an autosome. Males and females are usually affected with equal frequency. If both parents are heterozygous (Aa), each of their children has a 25% chance of expressing the trait of the recessive allele.