Albinism is a recessive disorder where there is a lack of melanin. Andrea and her husband Claude both have normal skin pigmentation. Andrea’s mother has the albino phenotype, but her father and her brother do not (normal pigmentation). Claude’s parents are both normal, but he has a sister who has the condition (is albino).  Answer the following questions   If Andrea and Claude are carriers for the albino allele, what is the probability that they have an albino child?    If Andrea and Claude have a second child, what is the probability this child be normal (non-albino)?

Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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  1. Albinism is a recessive disorder where there is a lack of melanin. Andrea and her husband Claude both have normal skin pigmentation. Andrea’s mother has the albino phenotype, but her father and her brother do not (normal pigmentation). Claude’s parents are both normal, but he has a sister who has the condition (is albino).  Answer the following questions  

If Andrea and Claude are carriers for the albino allele, what is the probability that they have an albino child? 

 

If Andrea and Claude have a second child, what is the probability this child be normal (non-albino)? 

 

NOTE: Draw a punnet square or show your work.

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