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7 Cards in this Set
- Front
- Back
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Incomplete dominance
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Neither allele is dominant
R1R1 = red RiR2 = PINK R2R2 = white |
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Tay-Saches Disease
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a fatal lipid-storage disorder
Homozygous recessive = die Heterozygotes = have only 50% of the enzyme, HEXOSAMINIDASE A (for lipid metabolism), in the body |
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Threshold effect
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When normal phenotypic expression occurs anytime a certain level of gene product is attained
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Codominance
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a joint expression of both alleles in a heterozygote;
both products must be phenotypically detectable |
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MN blood group
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illustrates codominance;
when two forms of glycoprotein (M/N) of red blood cells can coexist |
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Multiple alleles
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when three or more alleles of the same gene are found
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ABO blood groups
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illustrates "multiple alleles" effect;
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