Unit 4: Twins

Question 1

Twins: (identical):

Answer 1

•1 sperm + 1 egg.
•split of cells during cleavage (before morula).
•DNA in both siblings is identical.
•gender in both siblings is identical.

Question 2

Twins (fraternal):

Answer 2

•2 sperm + 2 egg.
•as alike as siblings.
•gender can be the same or different.