Twins that come from a single zygote
After the split, they can have changes especially from mutations
Monozygotic twins
Twins that only share similar genes 0.5 only
Dizygotic twins
The probability a pair of individuals will both have a certain characteristic
Concordance
Opposite: Discordance
The overgrowth syndrome where affected infants are larger than normal
Beckwith-Wiedemann syndrome
Opposite: Russell-Silver syndrome
X-linked recessive disorders (3)
Red-Green color-blindness
Hemophilia
Duchenne muscular dystrophy
X-linked dominant disorders (2)
Rett syndrome (autism)
Hypophosphatemic rickets
Y-linked traits or Holandric
Hypertrichosis (hairy pinna)