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