Determination of Sex and Identical vs. Fraternal Twins


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What is it called when the father's sperm fertilizes the mother's egg?

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1. How is the sex of a child determined?

2. Why will identical twins always be the same sex?

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About This Quiz & Worksheet

This quiz/worksheet combo will help test your understanding of what determines the sex of a child and how twins come about. All of the quiz questions are multiple-choice.

Quiz & Worksheet Goals

Find out what you know about the following:

  • True statements about fraternal twins
  • What determines the sex of a child
  • Term for when the father's sperm fertilizes the mother's egg
  • Twins that share 100% of same DNA
  • Example of zygosity

Skills Practiced

  • Reading comprehension - ensure that you draw the most important information from the related lesson on the determination of sex and twin status
  • Making connections - use your understanding of the concepts of sex chromosomes and how they influence the sex of a child
  • Defining key concepts - ensure that you can accurately define main phrases and words, such as zygosity
  • Distinguishing differences - compare and contrast types of twins

Additional Learning

The associated lesson, Determination of Sex and Identical vs. Fraternal Twins, explores this topic in greater detail. It covers the following areas:

  • Rumors vs. facts about sex determination
  • Chromosomes
  • Types of twins and how they're formed