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CalmSwan8973

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I'm trying to do my practice homework, but it is so confusing. I want to cry :( can anyone help me? Is this correct?

Kylan T

Hi CalmSwan,

Thanks for your question!

First of all, don't worry! It is normal to find homework hard sometimes. We're here to help.

Since Huntington's disease is a dominant disease, the matching genotype is either Hh or HH. But since one of the children is "normal", the genotype of both of the parents must be Hh (if it was HH, all the children would have Huntington's disease).

Therefore, as it is shown in the table, the genotypes of the kids are HH or Hh, which are the genotypes for having Huntington's disease. Their phenotype - their observable traits - is thus having Huntington's disease.

The only genotype allowing someone to not have Huntington's disease is hh (since it is a dominant disease).

If you need further explanations, you should take a look at this:

https://www.alloprof.qc.ca/en/students/vl/sciences/genetics-s1229

Don't hesitate to reach out again if needed:)

Kylan