Today Ms. Andrews explained Pedigrees. First she checked in UP pages 63-72. Then we went over the answers. If you missed it, try to check the answers with a friend. There is a quiz on punnet squares on Friday.
A pedigree is basically a chart to show gene dominance in a family through multiple generations. It shows the gender of the family members and if they have the recessive trait. They can be used to trace gene traits through many generations and to learn where a gene you might have comes from.
A square indicates a male, and a circle a female. If they are shaded that means they have the recessive trait(EX: rr, tt). A horizontal line connecting 2 shapes indicates a marriage line. A line going down stemming off of a marriage line is a children line, indicating the children the couple had together.
This is a key showing other shapes and their meanings.
This is a pedigree showing a long family line of a certain recessive trait spanning 3 generations.
next scribe... Jackson