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Spark Starter

Spark Starter. Spark Starter. Identify the following as incomplete dominance , Codominance or complete dominance . Explain your answer in complete sentences + Pedigree . .

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Spark Starter

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  1. Spark Starter

  2. Spark Starter Identify the following as incomplete dominance, Codominanceor complete dominance.Explain your answer in complete sentences + Pedigree. • A student crosses two fruit flies, one with long wings and the other with short wings. All of the offsprings come out having medium long wings. This is an example of which kind of inheritance? • When a breeder breeds two dogs one white and the other black he gets a puppy that is black with white dots. What can this breeder conclude about the mode of inheritance?

  3. Family Tree • Why do we have family trees?

  4. Pedigree = a Genetic Family Tree • It tells helps us to keep track of traits as they are passed down from generation to generation.

  5. How Do you Read a Pedigree 1 Generations are HORIZONTAL • All individuals sitting on the same Horizontal plane are from one generation 2 3 3 generations!

  6. Sex (Male or Female) MALES Squares = Circles = FEMALES

  7. Relationship (Married) Circle all the married individuals How many males are in this pedigree? How many females are in this pedigree? 7 7

  8. Relationship (Siblings) Draw a box around a set of siblings.

  9. How Do you Read a Pedigree Shading of the Pedigree • A Shaded individual has the disorder • Non-Shaded individual DOESN’T have the disorder • Half-Shaded individual is a carrier of the disorder

  10. Pedigree for Widow’s peakWrite in the Genotype & Phenotype Shaded individuals have a widow’s peak

  11. Pedigree for Widow’s peakWrite in the Genotype & Phenotype Shaded individuals have a widow’s peak

  12. Autosomal Dominant

  13. AutosomalDominant • Autosomal dominant inheritance is characterized by several features. • Statistically, males and females are equally affected, and half of all children of an affected parent are affected and half of the children are unaffected. • In addition, affected individuals occur in every generation in the pedigree, and the trait is only passed through these affected individuals

  14. Autosomal Recessive

  15. AutosomalRecessive • This unaffected person is the father of an affected son; both he and his wife are normal parents of an affected offspring, in concordance with the typical presentation of a recessive trait. • For this to happen, both parents must be carriers. • It is not surprising that his wife is a carrier, because she has affected siblings. • Her husband is probably a carrier, because this is the only likely way they produced a son who is affected. • Can skip generations

  16. Testing YOUR knowledge…

  17. Testing YOUR knowledge…

  18. Exit Ticket Is it possible that the selected pedigree is for an AUTOSOMAL RECESSIVE TRAIT? Why?

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