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Can We Risk It Again?

Genetics and Recurrent Pregnancy Loss

By Melanie E. Peffer

Can We Risk It Again?


 

Abstract

“Scott” and “Celeste” want to have another baby, but their plans go awry when Celeste miscarries twice. Students follow the couple’s struggle in this case study to learn about meiosis, independent assortment, chromosomal rearrangements, balanced translocation, and assisted reproductive technologies. The case involves the analysis of a real karyotype showing a male with a balanced translocation between chromosomes 9 and 22. Using this karyotype, students draw possible arrangements of chromosomes in the metaphase plate during meiosis I and make predictions about which of Scott’s gametes can produce viable offspring. The case was written with the intent of providing a real-world application of a variety of concepts covered in introductory genetics or biology while raising awareness of a common, yet misunderstood phenomenon, miscarriage. The goal is to provide students with a meaningful and relevant educational experience that will contribute to a reduction in pregnancy loss, improve care for bereaved parents, and promote equitable access to medical advancements.

   

Date Posted

01/02/2023

Overview

Objectives

  • Describe what a miscarriage is and compare types of miscarriage.
  • Identify causes of recurrent miscarriage.
  • Analyze a karyotype and infer biological consequences.
  • Diagram potential gametes and make predictions about risk for pregnancy loss.
  • Identify and explain how assisted reproductive technologies highlight social inequities in medicine.
  • Compile a list of recommendations for standards of care for pre-pregnancy planning.

Keywords

Meiosis; genetics; chromosomes; chromosomal rearrangement; translocation; miscarriage; law of independent assortment; assisted reproductive technology; recurrent pregnancy loss;

  

Subject Headings

Biology (General)
Cell Biology
Genetics / Heredity
Medicine (General)
Molecular Biology

EDUCATIONAL LEVEL

High school, Undergraduate lower division, Undergraduate upper division

  

FORMAT

PDF

   

TOPICAL AREAS

Social issues

   

LANGUAGE

English

   

TYPE/METHODS

Analysis/Issues, Discussion, Interrupted

 

 

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