Traits, Genes, and Alleles 6.3 6.4 TERMINOLOGY FOR THE SUCCESS OF GENETICS.

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Presentation transcript:

Traits, Genes, and Alleles TERMINOLOGY FOR THE SUCCESS OF GENETICS

FATHER OF GENETICS

Term: TRAIT Biological factor being studied. Example: A blood disease like hemophilia or bleeder’s disease!

Term: DOMINANCE: THE PREDOMINANT FORM OF A GIVEN TRAIT. Example: Brown eyes are dominant to blue eyes.

Term: RECESSIVE A form of a trait not expressed frequently. Example: Being left handed!

Term: Gene A DNA unit of heredity located on a chromosome that controls traits! Example: Look at the “Human Genome” chart on the side board that shows genes for given characteristics!

Term: ALLELE A gene for a given trait: Examples: A B or O for blood types

Term: HYBRID A condition resulting from the cross of two, pure, contrasting traits of a given characteristic such as eye color. Example: BB x bb Bb = Hybrid!

Term: PHENOTYPE Physical appearance of a given characteristic. Example: Type A blood Eye color - Brown or blue Right or left handed

Term: GENOTYPE The allele expression of a given characteristic. Example: BB, Bb, or bb. BB - HOMOZYGOUS DOMINANT bb - HOMOZYGOUS RECESSIVE Bb - HETEROZYGOUS

Quiz XX tt Yy zz Oo TT AA jj Tt Bb Ii Kk Nn NN Nn rr