Gregor Mendel

Father of genetics. Experimented with pea plants and discovered law of dominance

Punnett Square

diagram showing the gene combinations that might result from a genetic cross


To breed two individuals


Specific characteristic that varies from one individual to another

Heritable trait

Trait that is passed from parent to offspring


The different forms of a gene.


trait that will show up in an organism's phenotype if gene is present


trait of an organism that can be masked by the dominant form of a trait


The particular alleles at present in an organism


Physical characteristics


Having two identical alleles for a trait
for example: HH or hh


Having two different alleles for a trait
for example: Hh

Complete Dominance

A relationship in which one allele is completely dominant over another

Incomplete Dominance

creates a BLENDED phenotype; one allele is not completely dominant over the other


creates a phenotype in which BOTH alleles for a gene are fully expressed.


Diagram that shows the occurrence of a HERITABLE TRAIT in several generations of a family


Represented by squares in a pedigree.


Represented by circles in a pedigree.

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