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The final section of Populations and Ecosystems, the impossible section.


Any general structure, characteristic or behavior of an organism. Things like wings, fur pattern, color, migration, etc...


The specific expression of a feature in an individual. Things like wing length, density, etc...


The process of passing genetic info from one generation to the next.


An organelle in the eukaryotic cell that is surrounded by a membrane which contains a cell's DNA.


The blueprint of the cell. This long structure gives the instructions for how the cell functions. This is called inheritance.


DNA coiled again into a tight structure.


A section of DNA that contains the instructions of a protein. Different genes control different features.


The version of the gene. Different alleles can have different traits.


The combo of alleles in an organism's chromosomes represented by 2 letters.

Dominant Allele

The version of the gene that is more influential. The trait of this allele that will be seen over the recessive allele.

Recessive Allele

The version of the gene that is more influential. The trait for this allele will be hidden by the dominant allele.


The trait observed in an organism itself.


A genotype with 2 identical alleles. It may be 2 dominant or recessive alleles.


A genotype with one dominant allele and one recessive allele.

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