Unit 5: Sex Linked Inheritance & Pedigrees

Question 1

Pedigrees:

Answer 1

•pedigrees can be used to predict the genotype of a given individual, or to determine the mode of inheritance of a particular trait.

Question 2

Autosomal inheritance:

Answer 2

•traits that “travel” on the first 22 pairs of chromosomes.

Question 3

Autosomal dominant:

Answer 3

•gene is located on chromosomes 1-22.
•dominant means a single copy of the mutated gene is enough to cause the disorder.
-both males and females are affected.
-trait appears in all generations.
-unaffected parents have an unaffected child.

Question 4

Autosomal recessive:

Answer 4

•gene is located on chromosomes 1-22.
-recessive means inheriting a mutated gene from both parents causes the disorder.
-both males and females are affected, trait skips generations.
-one affected parent does not always produce an affected.

Question 5

Sex-linked:

Answer 5

•humans have 1 pair of sex chromosomes:
•females XX, male XY:
•males determine the sex.
•always a 50% chance of having either a girl or a boy.
•sex-linkage:
-muscular dystrophy gene (example).
-most often in males.
-on the