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Inheritance Patterns Name Normal Dominance Definition One allele can mask another recessive in heterozygous individuals. Visual Example Homozygous red flower (RR) X white flower (rr) will result in 100% red offspring. Incomplete Dominance Form of intermediate inheritance in which one allele for a specific trait is not completely dominant over the other allele. This results in a third phenotype that is a combination of the dominant and recessive phenotypes. Homozygous red flower (RR) X homozygous white flower (WW) will result in 100% pink flowers. A person with curly hair and person with straight hair will have offspring with wavy hair. Codominance Form of inheritance where the traits expressed by the alleles are equal in the phenotype. Homozygous red flower (RR) X homozygous white flower (WW) will result in 100% red and white polka dot flowers. Blood Type. There are three alleles for blood type. 2 alleles produce surface antigens A or B. The third allele O produces no antigens. Both alleles inherited from your parents are expressed. That is why some people can have type AB blood. Sex-Linked A cross between a heterozygous red female and red male can produce only male white flowers. Hemophilia (a blood clotting disorder) and color blindness are recessive mutations located on the X chromosome. Because males have only on X, they are more likely to have these disorders. Most females would have the dominant allele to mask the recessive one. Trait controlled by a gene located on the sex chromosome, usually the X, making it more likely for males to express the recessive trait. Punnett Square Real Example Normally pigmented skin (presence of melanin pigment) is dominant over albinism (lack of melanin pigment).