Mind Stretcher 2/11/16 1. Asexual reproduction relates to humans in that A. none of our body cells reproduce this way. B. many body cells reproduce this way. C. the parent cells do not divide. D. meiosis occurs. 2. How are sex cells different from other human cells? A.They have more chromosomes. B.They have half as many chromosomes. C.They are larger. D.They have no chromosomes. 3/14/20161

Pedigrees

3/14/20163 What is a Pedigree? A family tree A pedigree is a diagram of family history over several generations. It uses symbols to represent people and lines to represent genetic relationships. These diagrams make it easier to visualize relationships within families, particularly large extended families. Pedigrees are often used to determine the mode of inheritance (dominant, recessive,) of genetic diseases.

3/14/20164 Sample Pedigree

3/14/20165 Reading A Pedigree Squares represent males. Circles represent females. Horizontal lines connecting a male and female represent a marriage. Vertical lines extending downward from a couple represent their children. Oldest individuals are found at the top of the pedigree.

3/14/20166 Lets look again. How many males? How many females? How many generations?

3/14/20167 Purpose The purpose of a pedigree is to analyze the pattern of inheritance of a particular trait. The symbol of all individuals that possess this trait are shaded in.

3/14/20168 Dominant or Recessive Traits Determine whether the disorder is dominant or recessive. –If the disorder is dominant, one of the parents must have the disorder. –If the disorder is recessive, neither parent has to have the disorder because they can be heterozygous.

3/14/20169 Example of Pedigree Charts Dominant or Recessive?

3/14/ Dominant!! Because one parent carries the trait.

3/14/ Dominant or Recessive

3/14/ Recessive. Because neither parent carries the disorder.

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