1. Usually only one of these, the dominant allele, is expressed in the phenotype.

2. Dominant allele: an allele, which has the same effect on the phenotype of an organism, whether the organism is homozygous or heterozygous for the gene.

3. The allele can divide into two different types: dominant allele and recessive allele.

4. The dominant allele usually controls the normal form of the gene, while mutations are generally RECESSIVE.

5. The A allele was the dominant allele in the most domestic pig populations investigated, while the B allele was the dominant allele in Meis-han pigs, Wuzhishan pigs, Tibetan pigs and Rongehang pigs.

6. When an organism is heterozygous for a trait, the resulting phenotype for that trait expresses only the dominant allele .

7. Recessive allele : an allele, which only shows in dominant allele is present.

8. RESULTS: In 30 P. falciparum infections, 38 different alleles were found. Of them, the dominant allele was a variant of MAD20, while was K1 less and the RO33 was few.

9. The result indicate that population gene frequency variety expedite by selection and the test testify green-shell character is controled by a pair of complete dominant allele.