Question

URGENT!!! Why do identical twins have the same set of genes?

1) they are born of the same parents
2) one or more gametes underwent nondisjunction
3) they were born of one fertilized ovum
4) they both have haploid chromosomes

Answer 1

They were born of the one fertilized ovum

Step-by-step explanation:

Referenced in this statement: "As a result, no two persons are exact genetic duplicates, with the exception of identical twins. Identical twins are the products of the same fertilized egg and have identical genes. Even identical twins may appear and behave differently as a result of varying environmental factors in their lives."

Answer 2

Answer: 3. They were born of one fertilized ovum.

Explanation: A zygote is formed

when an egg is fertilized by a sperm. The zygote then undergoes a mitotic division into two and each half will further develop into a separate embryo. The two embryos formed will develop into identical twins.