Problem 1-  Autosomal Dominant: Widow’s peak (hairline) Having widow’s peak is a dominant trait (use W and w to represent alleles)   A man who has a widow’s peak has a child with a woman that does not have widow’s peak. Their child does not have widow’s peak.   What is the genotype of the father? _______________   B.)          A man with widow’s peak (WW) has a child with a woman who does not have a widow’s peak.   What is the probability their child will have a widow’s peak? ____________   Fill out this Punnett square: C.)            If both parents are heterozygous for widow’s peak (Ww)…

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Background Reminders:  

  • Dominant allele will express itself in the phenotype even when in combination with a different allele (recessive).
    • Example: PP and Pp (purple flowers)
  • Recessive allele does not express itself in the phenotype when combined with another allele (dominant)
    • Example: pp (white flower) -> expressed only when recessive is by itself

 

Problem 1-  Autosomal Dominant: Widow’s peak (hairline)

  • Having widow’s peak is a dominant trait (use W and w to represent alleles)

 

  • A man who has a widow’s peak has a child with a woman that does not have widow’s peak. Their child does not have widow’s peak.

 

What is the genotype of the father? _______________

 

B.)          A man with widow’s peak (WW) has a child with a woman who does not have a widow’s peak.

 

What is the probability their child will have a widow’s peak? ____________

 

Fill out this Punnett square:

C.)            If both parents are heterozygous for widow’s peak (Ww)…

 

What is the probability their child will have a widow’s peak? _______________

 

Fill out this Punnett square:

 

                                                      

  • If both parents do not have widow’s peak, what is the probability their child will have a widow’s peak?________________

 

Problem 2- Autosomal Recessive:  Attached Earlobe

 

  • Having an attached earlobe is a recessive trait (use E and e to represent the alleles).

 

A.)  A woman with an attached earlobe has a child with a man who has an unattached earlobe (heterozygous – Ee).

What is the probability their child will have an attached earlobe? ____________

Fill out the Punnett square below to answer this.

B.)  If both parents are heterozygous for unattached earlobe (Ee)…

What is the probability their child will have an attached earlobe? _______________

Fill out the Punnett square below to answer this.

 

                                                      

 

C.) If both parents have attached earlobes, what is the probability their child will have attached earlobe?________________

 

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