patterns of inheritance. 1. polygenic traits -traits controlled by many genes ex. skin color: 6...
TRANSCRIPT
1. Polygenic traits -Traits controlled by many genes
ex. Skin color:
• 6 genes control the amount of melanin produced
• more melanin means darker skin color
2. Complex Characters- traits affected by the environment as well as genetics• Exposure to sunlight :
skin color• Nutrition:
Height, Diabetes, Heart disease• Soil type:
Hydrangea flowers are blue if grown in acidic soil
6. Sex influenced traits-influenced by sex hormones
Ex: baldness – influenced by testosteronedominant in menrecessive in women
7. Incomplete DominanceEx: Sickle Cell Trait
• Point mutation on chromosome 11 causes improperly formed hemoglobin.
• This causes sickle shaped red blood cells which cannot carry oxygen properly and may clog capillaries
Genotype phenotypeSS Normal red blood cells
AA Has sickle cell disease
AS is a carrier of sickle cell, has few symptoms, is resistant to malaria