Pedigree patterns

Question 1

Autosomal dominant

Answer 1

-Males and females are equally likely to have the trait
-Traits do not skip generations
-The trait is present whenever the corresponding gene is present
-These is male to male transmission

Question 2

Autosomal recessive

Answer 2

-Males and females are equally likely to have the trait
-Traits often skip generations
-Often, both parents of offspring who have the trait are heterozygotes
-Only homozygous individuals have the trait
-Traits may appear in siblings without appearing in their parents
-If a parent has the trait, those offspring who do not have it are heterozygous carriers of the trait

Question 3

X Linked dominant

Answer 3

-All daughters of a male who has the trait will also have the trait
-There is no male to male transmission
-A female who has the trait may or may not pass the gene for that trait to her son or daughter

Question 4

X linked recessive

Answer 4

-The trait is far more common in males that in females
-All daughters of a male who has the trait are heterozygous carriers
-The son of a female carrier has a 50 percent chance of having the trait
-There is no male to male transmission
-Mothers of males who have the trait are either heterozygous carriers or homozygous and express the trait
-Daughters of female carriers have a 50 percent chance of being carriers