Jack and Jill are _____ twins. They are the result of _____.

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When evaluating the statement 'Jack and Jill are _____ twins. They are the result of _____,' we need to match the correct twin type with its cause.
Option 1: 'gamete; two ova that were fertilized by one sperm' This is inaccurate because a single sperm fertilizing two ova does not describe a standard fertilization event leading to twins; it would imply two separate zygotes, not a single gamete concept. Also, 'gamete' is a reproductive cell, not the correct descriptor for the twins themselves.
Option 2: 'zygotic; one ovum that was fertilized by two sperm' This would describe a phenomenon called polyspermy, which is biologically abnormal and does not produce typical twins. A zygote forms from one ovum fertilized by one sperm; two sperm entering one ovum do not generate standard zygotic development.
Option 3: 'dizygotic; two separate ova that were fertilized by two different sperm' This correctly identifies dizygotic (fraternal) twins as arising from two distinct ova and two separate sperm, resulting in two genetically unique zygotes.
Option 4: 'monozygotic; one ovum fertilized by one sperm that split into two zygotes' This describes monozygotic (identical) twins, where a single fertilized ovum splits to form two individuals, not two separate ova. This option misattributes the mechanism for nonidentical twins.

In summary, the correct concept aligns with dizygotic twins caused by two separate ova fertilized by two different sperm, while the other options either describe incorrect mechanisms or apply the wrong twin classification to the scenario.

Intro to Child Psychology CHILD PSYC Exam #1 - Due 10/1

Jack and Jill are _ twins. They are the result of _.

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