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A genetic cross in which the parents differ in only ONE characteristic; solved using a Punnett square with four boxes.
A genetic cross in which the parents differ in TWO characteristics; solved using a Punnett square with sixteen boxes.
An unknown dominant organism (such as AA or Aa) is crossed with a recessive organism (aa). The offspring are examined to determine if the unknown parent is homozygous dominant or heterozygous.
Situation in which the dominant allele is unable to completely hide the recessive allele. The heterozygous organism has an intermediate phenotype (such as pink flowers).
Situation in which two alleles are equally dominant and both are expressed (such as Type AB blood).
Situation in which a gene contains three or more alleles (instead of the usual two). For example, the blood type gene has three alleles (A, B, O).
Complicated traits with lots of variety are controlled by two or more genes. This is common in humans.
Special term for Type AB+ blood which can receive blood from individuals of any blood type.
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