Chapter 6

Question 1

Y-Linked inheritance

Answer 1

Only males affected
Father transmits to ALL sons
Does not skip generations

Question 2

X-Linked Recessive

Answer 2

More males than females are affected
Affected sons are usually born to unaffected mothers
Never passed father to son
All daughter of affected fathers are carriers

Question 3

X-Linked Dominant Trait

Answer 3

Both males and females are affected. (Mostly males)
Does NOT skip generations
Affected fathers will pass the trait on to all of daughters

Question 4

Autosomal Dominant Trait

Answer 4

Appears in both sexes with equal frequency
Does NOT skip generations
Affected offspring must have an affected parent

Question 5

Autosomal Recessive

Answer 5

Appeared in both sex’s with equal frequency
Tends to skip generations
Affected offspring are usually born to unaffected parents

Question 6

Monozygotic Twins

Answer 6

Identical twins sharing 100% DNA

Question 7

Dizygotic Twins

Answer 7

Non identical twins that share 50% DNA
Have a lower concordance

Question 8

Prenatal Genetic Testing

Answer 8

Ultrasonography; Amniocentesis; Chronic Villus Sampling

Question 9

Ultrasonography

Answer 9

Detects the:
Size of fetus
Neural-tube (spinal column and skull)
Skeletal abnormalities
Is used in amniocentesis and CVS

Question 10

Amniocentesis

Answer 10

Done during the second trimester of pregnancy
Collection of Amniotic fluid (fetal cells)
Test for genetic disorders and birth defects