A、an allele that confers a phenotype on the organism when heterozygous; that is, when present in only one copy
B、an allele that confers a phenotype only when both copies of the gene are mutant; that is, when homozygous
C、an allele that is commonly found in wild populations, as opposed to alleles found in laboratory strains or when a pathological condition is present
D、an allele that confers a normal phenotype under some conditions, but confers a different, mutant phenotype when conditions such as elevated temperature are present
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A、melanocytes in the skin
B、mesoderm of the face and skulll
C、peripheral nervous system
D、all of these
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