Passing of Traits Traits Traits are the set of characteristics that an organism inherits from it’s parents. Traits are determined by the genetic material that is passed from parents to offspring. An organism’s genetic material (DNA) is contained in the cells that make up that organism. Examples of Traits Physical Traits Hereditary Disorders Eye color Sickle cell anemia Eye shape Down’s Syndrome Hair color Huntington’s disease Type of hair Marfan’s syndrome Freckles Dwarfism Nose Hemophilia Thumb Colorblindness Passing of Traits Scientists who study the passing of traits are called geneticists. Geneticists use Pedigree charts to study the passing of traits through a family to determine if a particular trait is going to show. Pedigree Charts To the right is a Pedigree chart. A pedigree chart is very much like a family tree. Pedigree charts are like a map of where particular traits have come from. Pedigree Charts (cont’d) The squares represent males and the circles represent females. Horizontal lines between a circle and a square indicate a couple who has reproduced. Pedigree Charts (cont’d) In this pedigree chart, the red colored circles and squares indicate the individuals whom have the trait being examined. What have you learned so far? In this Pedigree, how many children did the first couple have? A. 5 B. 6 C. 8 D. 9 What have you learned so far? In this Pedigree, how many grandchildren do the first couple have A. 8 B. 9 C. 10 D. 19 What have you learned so far? In this Pedigree, how many of the first couple’s children had children? A. 1 B. 2 C. 3 D. 4 E. 5 What have you learned so far? In this Pedigree, the child highlighted received its affected gene from its’ A. Mother’s mother B. Mother’s Father C. Father’s Father D. Father’s Mother What have you learned so far? In this Pedigree, what is the reason the indicated child does not show the affected trait? A. Because the child is a boy. B. Because the child is a girl C. Because the mother didn’t give the trait to the child D. Because the father didn’t give it to the child.
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