Both of Ruth's parents have a round face, a dominant trait. Ruth, however, was born with a square face.  What does Ruth's phenotype imply about her parents' genes?    a. Ruth's parents are both heterozygous when it comes to their facial shape.            b. When it comes to facial shape, Ruth's parents gave her one dominant gene and one recessive gene.            c. Ruth's parents are both homozygous when it comes to their facial shape.            d. Ruth's sister also has a square face.

Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
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Both of Ruth's parents have a round face, a dominant trait. Ruth, however, was born with a square face. 

What does Ruth's phenotype imply about her parents' genes?

  
a. Ruth's parents are both heterozygous when it comes to their facial shape.
 
 
 
 
  
b. When it comes to facial shape, Ruth's parents gave her one dominant gene and one recessive gene.
 
 
 
 
  
c. Ruth's parents are both homozygous when it comes to their facial shape.
 
 
 
 
  
d. Ruth's sister also has a square face.
 
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