Galactosemia is an inherited disorder in humans. A person with the disorder cannot digest the sugars in milk. The allele for normal digestion (G) is dominant; the allele for galactosemia (g) is recessive.

A female who is heterozygous for the galactosemia trait and a male who has galactosemia have a child.

Describe how this disorder could have been passed on in the family. In your response, be sure to

• identify the genotype of the father
   
• complete a Punnett square to show the possible genotypes and phenotypes of the child
   
• describe the probability that the child will inherit galactosemia
   
• describe all the possible genotypes and phenotypes of the father's parents; explain your answer