Um casal X teve filhos gêmeos, um menino e uma menina. Ao crescer, um dos filhos do casal X se casa, e tem dois filhos gêmeos , originados do mesmo zigoto. Os filhos e os netos do casal X são considerados , respectivan que tipo de gêmeos? Bivitelinos e monozigóticos. Univitelinos e fraternos. Identicos e univitelinos. Fraternos e bivitelinos.

## Step 1: Understanding the Types of Twins<br />### There are two main types of twins: monozygotic (identical) and dizygotic (fraternal). Monozygotic twins result from a single fertilized egg splitting into two, leading to genetically identical offspring. Dizygotic twins result from two separate eggs being fertilized by two different sperm cells, leading to genetically unique siblings.<br /><br />## Step 2: Analyzing the Scenario for the Children of Casal X<br />### The couple X has twins, a boy and a girl. Since they are of different sexes, they cannot be monozygotic (identical), as identical twins must be of the same sex. Therefore, the children of casal X are dizygotic (fraternal) twins.<br /><br />## Step 3: Analyzing the Scenario for the Grandchildren of Casal X<br />### One of the children of casal X has twins that are "originated from the same zygote." This indicates that these grandchildren are monozygotic (identical) twins, as they come from a single zygote.<br /><br />## Step 4: Matching with the Options<br />### Based on the analysis, the children of casal X are fraternal (dizygotic), and the grandchildren are identical (monozygotic). The correct option should reflect this combination.