Because the genetic makeup of __________ twins is nearly identical,researchers can conclude that variations in their behavior is probably due to environmental factors.

A) dizygotic
B) homozygous
C) monozygotic
D) heterozygous

Monozygotic Twins

Twins that develop from a single fertilized egg and are genetically identical.

Dizygotic Twins

Also known as fraternal twins, these are two siblings born at the same time who have developed from two different eggs fertilized by two different sperm cells.

Homozygous

Describes an organism with two identical alleles for a particular trait or gene.