Pedigrees

Question 1

Multiplication rule

Answer 1

“AND” = multiply

P(A and B) = P(A) * P(B)

Question 2

Autosomal Dominant pedigrees

Answer 2

Unshaded individuals are all homozygous recessive

Shaded individuals are heterozygous or homozygous dominant

Question 3

Autosomal Recessive Pedigrees

Answer 3

Shaded individuals are homozygous recessive

Unshaded individuals that have shaded children must be heterozygous

Question 4

X-Linked Recessive Pedigrees

Answer 4

Males only need one copy of the gene to show it

If a female has it, all of her sons will have it

For a female to have it, her father must