Pedigree Chart Activity Worksheet (Page 2 of 4) in pdf

Pedigree Chart Activity Worksheet Page 2

Section B: Use the Flipnob family!

All living things have pedigrees. A pedigree is a diagram that shows the occurrence and appearance (phenotype)

of a particular genetic trait, as it is passed from one generation to the next in a given family. From this

information, along with an understanding of inheritance, genotypes of individuals can often be determined.

Part 1: How to make a Pedigree Chart.

Symbols:

1. Boxes represent males.

2. Circles represent females. O

Note: Filled in squares and circles indicate particular traits expressed in those individuals

Relationships:

3. A horizontal line connecting a male and female indicates a mating.

a. A vertical line from this type of horizontal line indicates offspring.

b. If there are several offspring, indicate this by a second horizontal line with a

vertical line extending from it for each offspring.

c. Number form oldest to youngest

4. Twins are indicated as shown below.

II.

Space the offspring at equal distances along this second horizontal line for neatness.

Where two families intermarry, the corresponding generations should always be in line with each other.

Pedigree Chart Activity Worksheet Page 2