Inheritance

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Inheritance

  1. 1. He was known as “Father of Genetics”He discovered how traits were inheritedGenetics: it is the study of heredityHeredity: the passing over traits from parent to offspring
  2. 2. Mendel did his study on pea plantsPea plants have many traits(tall/short, purple flowers/ white flowers)Pea plants can be self- fertilised or cross fertilised
  3. 3. 1. True-breeding: These plants always create plants that look like themselves2. Hybrid: Offspring of true- breeding plants Tall x short= Hybrid
  4. 4. Some traits are dominant over othersTall x Short= all tall offspring(hybrid)Tall is the dominant traitShort is recessive
  5. 5. Mendel discovered that each trait is controlled by two factors (alleles)Genotype: what genes, letters, the organism has(TT, Tt,tt)Phenotype: what it looks like (tall or short)Genes: factors that determine your trait
  6. 6. Explaining the crossWhen a parent makes sperm or egg, their genes separate (principle of segregation)The gametes (egg or sperm) contain either a T allele (tall) or t allele.
  7. 7. 1. A one eyed purple people eater is crossed with a two eyes. Which one is dominant?2. If you use the letter E for this gene. What is the offspring?
  8. 8. 3. Are these offspring the f1 or f2 generation?4. If you crossed the offspring with each other, how many of the new offspring would you expect to have two eyes?

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