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Biology 1 Chapter 12


A condition in which neither of two alleles of a gene is dominant or recessive., A condition in which both alleles for a gene are fully expressed

incomplete dominance

A pattern of inheritance in which two alleles, inherited from the parents, are neither dominant nor recessive. The resulting offspring have a phenotype that is a blending of the parental traits.

polygenic inheritance

combined effect of two or more genes on a single character


A person whose genotype includes a gene that is not expressed in the phenotype.


An organism's physical appearance, or visible traits. How you look IE: hair color, eye color, etc


A picture of all the chromosomes in a cell arranged in pairs


A chart or "family tree" that tracks which members of a family have a particular trait

what are some sex linked genetic problems

colorblindness, muscular distrophy, hemophilia, Color blindness and hemophilia. Males only have one X chromosomes, males are likely to have these conditions. Only females can be carriers. The cause of hemophilia are sex-linked recessive allele on the X chromosomesm, the symptoms of hemophilia are that the blood clots slowly or not at all, and therapy of hemophilia is blood clotting protien produced by cows.

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