Name ____________________________________________________________Date ______________________Block:____________

3.2 HEREDITY VOCABULARY

TERM DEFINITION PICTURE

Chromosome

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FOR A HUMAN ... • Body cells= 46 chromosomes or (23 pairs)

• Sex cells= 23 chromosomes

Genes

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• 28,000 genes in a human cell.

• For each trait, there are TWO genes (one from mom one from dad)

Alleles

Dominant

• The trait that ALWAYS appears.

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Recessive

• The trait that “seems” to fade into the background

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Genotype

• The combination of inherited alleles together

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Phenotype

• An organism’s PHYSICAL appearance.

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Heterozygous

• The gene from the female parent is DIFFERENT from the gene from male

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Homozygous

• The gene from the female parent is DIFFERENT from the gene from male

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Co-Dominance

Incomplete Dominance