Congratulations!

• You have just become a detective. Your goal is to figure out why certain family members have specific traits!

• How are you going to accomplish your goal?

Genetic Pedigree

What is a pedigree?

• Chart of the genetic history of family over several generations

• Scientist or genetic counselor finds information and makes the chart to analyze it

Constructing a Pedigree

• Female

• Male

Connecting People

• Married couple

• Offspring

Connecting People

• Fraternal Twins

• Identical twins

What does a pedigree chart look like?

How do they work

• Video• We can’t always determine if something

is heterozygous. As we go through our examples and worksheet you are worried about completely filling in the recessive traits.

Let’s look at an example!

• Muscle type is not a sex linked characteristic. Fast twitch muscles dominate over slow twitch muscles

Place the Genotype of each individual below its symbol

ff

ff

ffff

Ff Ff Ff Ff Ff

Ff FfF?

F?

F?