Inheritance

Last updated Sep 23, 2022 Edit Source

• Sequence of neuclotide, control the production of a polypeptide
• Unit of inheritance

• Alternative form of a Gene

T - tall allele t - dwarf allele Same Gene - Height of plant

B - blue iris b - black iris Same Gene - Colour of iris

• Always express
• Capital letter B, T

• Only express when homologous recessive, bb, tt

• Blood type

• Same allele

• Different allele

• Outward apparant
• Tall, blue iris

• Genetic made up
• Tt, TT, Bb

• Tt Tt Tt tt
• 3:1

• Tt tt Tt tt
• 1:1

• Small number of progeny

• XY

• XX

1/2 probability, not affected by 1st child 2nd child

• Radiation
  • X-ray
  • Gamma ray
• Chemical
  • Tar
  • Mustard gas

• Albine
• Sickle Cell Anemia

• Down syndrome
• One more chromosome

• Gene + environment
• Mass, height, skin colour, IQ
• Range/mean, intermediate

• Gene
• Blood type, Colour of Iris
• Discrete

• Random Mutation lead to Genetic Variation
• Competition (food / fire resistance / drought resistance)
• Differential survival
  • Selective advantage / Selection pressure
• Survival & Reproduce
• Pass down the favorable gene to the next generation
• Lead to Natural Selection
• Billion years for the accumulation of different characteristics/features

Human decides, Commertial values

• 2 Parents
  • Drought resistant wheat x High yield wheat
• Select the hybrid that have the characteristics
• Discard the unwanted
• Repeat process for many generations (time consuming)