Pedigrees

Question 1

Generations

Answer 1

Individuals in each generation may be numbered or named

Siblings are placed in birth order from left to right oldest to youngest

Question 2

Symbols part 2

Answer 2

Circle=female
Square=male
Normal or without trait=unshaded
Trait=shaded

Question 3

Analysis

Answer 3

How many offspring were produced by generation 1? Deaths are shown with a slash.

Question 4

Symbols part 3

Answer 4

If an individual has one recessive allele for a trait the person is a carrier this is shown with a half shaded square or circle

Question 5

Generation part 2

Answer 5

Each generation is (often) labeled with a Roman numeral. Oldest generation at top of pedigree current generation at the bottom

Question 6

Symbols for pedigrees

Answer 6

Married couples or couple or couple producing offspring = horizontal line connecting midpoint of circle and square

Question 7

Polydactyl trait

Answer 7

Who is the first individual with the trait on the pedigree char? Who did individual #7 generation lll inherit the trait from?