Pedigrees

How many alleles does a person carry for a trait?

• 1

• 2

• 3

• 4

How many alleles does a child get from each parent for a trait?

• 1

• 2

• 3

• 4

On a pedigree, this symbol represents a ---

• not affected female.

• not affected male.

• affected male.

• affected female.

On a pedigree, this symbol represents a ----

• not affected male.

• not affected female.

• affected male.

• affected female.

In a pedigree, which shape represents a male?

• circle

• square

How many individuals are there in the 3rd generation?

• 1

• 2

• 4

• 6

How are individuals III-2 and II-4 related?

• Brother and sister

• Dad and daughter

• Uncle and niece

• Grandfather and granddaughter

What is the mode of inheritance shown here?

• Recessive because it "skips" a generation

• Dominant because it shows up in every generation

In the second generation of this pedigree, how many people are carriers of the trait? *Remember: a carrier does not have the disorder/disease, but can pass it on to his/her children.

• 1

• 2

• 3

• 5

Why do all the daughters in Generation II carry the colorblind gene?

• Because mom passed on the gene.

• Because dad passed on the X chromosome.