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Human Body Is Made of Cells and Reproductive Organs
Human Body Is Made of Cells and Reproductive Organs
You’re working as a summer intern in a genetic counseling clinic. You’re talking with parents who have had genetic testing done, and their results indicate that their child is likely to have Down Syndrome. You have three karyotypes for chromosome 21 in front of you to work with:
The parents have had an introductory biology course and have some understanding of biological concepts, but it’s been many years. They’ve asked for an explanation of why this happened. Your job as the intern is to produce short explanation for the parents about the molecular process by which Down Syndrome arises.
Using your understanding of material from lectures and the textbook, explain this chromosomal mutation to the parents (in the context of meiosis I and II). Be sure that the explanation demonstrates your understanding of meiosis, including where, when, and how meiosis occurred. It should be written in your own words. Be sure to use correct nomenclature and explain what terms mean. Do not include every step of meiosis, the mechanics of the spindle, or the nuclear envelope breakdown in your explanation. Instead, explicitly focus on the behavior and movement of the chromosomes.
To reiterate, you are being asked to write an explanation of 300-400 words (about one page) to explain to the parents:
Where, when, and how meiosis occurred.
Given the genetic analysis of the karyotypes/genotypes, what happened at the level of meiosis to produce three chromosomes 21s in the child.
In which parent the chromosomal mutation occurred.
At what stage in meiosis the chromosomal mutation occurred
You should refer to the karyotypes and genotypes in your explanation. Your role here is to write as an informed, distanced science student. Your language should be straightforward and as uncomplicated as possible. You should explain the vocabulary that you think is critical, as the sample text does (or as the bolded words in sections of your textbook does).
