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PATTERNS OF HEREDITY. CHP. 10. INCOMPLETE DOMINANCE. An individual displays a trait that is intermediate between the two parents. Neither allele is completely dominant Ex: red vs. white = pink Hair texture: straight vs. curly = wavy. CODOMINANCE. Equal expression of both alleles - PowerPoint PPT Presentation
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PATTERNS OF HEREDITYCHP. 10
INCOMPLETE DOMINANCE
• An individual displays a trait that is intermediate between the two parents.
• Neither allele is completely dominant
• Ex: red vs. white = pink
• Hair texture: straight vs. curly = wavy
CODOMINANCE
• Equal expression of both alleles
• Ex: Type AB blood
POLYGENIC INHERITANCE• Inheritance pattern of a trait
that is controlled by 2 or more genes
• Can be on the same chromosome or different ones
• Ex: eye color, skin color, height
ENVIRONMENTAL INFLUENCES• Internal environment- age,
gender can affect gene function, hormones, structural differences
• External environment- temperature, nutrition, light, chemicals, infection
SELECTIVE BREEDING• Produces organisms with
desired traits (dogs, horses)
• Eliminate undesired traits by inbreeding (mating closely related individuals), keeps a pure line
• Testcross- cross of an individual of unknown genotype with an individual of known genotype
Carrier- heterozygous, looks like a homozygous dominant individual
HYBRIDS• Mating of closely related
species
• The offspring are sterile
• Rarely happens in nature
• Ex: Liger (lion x tiger)
Wolfdog Wolphin
Zeedonkey Grolar bear
CAMA