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Vocabulary #9

Unit 12 - DNA & Heredity

TermDefinition
81. allele one member of a gene pair for a certain trait. You inherit one from each parent.
82. homozygous / purebred When both alleles (genes) are the same. Examples: AA, aa, BB, ff
83. heterozygous / hybrid When each of the two alleles (genes) is different. Examples: Aa, Bb, Ff
84. genotype the combination of alleles (genes) for a certain trait. Examples: AA, Aa, BB, Bb
85. phenotype physical characteristics observed, depends on the genotype and which genes are dominant.
86. trait a characteristic of an organism. Some are inherited, some are not.
87. inherited received from parents by genetic transmission (genes are passed down from parents to offspring)
88. Dominant gene An allele (gene) that "covers up" recessive genes in a heterozygous genotype. Represented by a capital letter. It only takes one of these genes for the trait to appear in the organism.
89. recessive gene An allel (gene) that is "weaker" and gets "covered up" or masked by the dominant allele (gene) in a heterozygous genotype. It takes two of these genes for the trait to appear in the organism.
90. Gregor Mendel a monk who did experiments on pea plants to learn about how traits are inherited. He discovered how dominant and recessive traits work.
Created by: coradesj
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