Determine the genotypes of the f2 progeny

1. Ahomozygous black female guinea pig is crossed to a white male. An F1 son is backcrossed to its mother. Please diagram the cross and backcross and determine the genotypes of the F2 progeny.

2.In Drosopphila,sepia colored eyes are due to recessive allele s and wild type(red color) to its dominant allele ^s+. If sepia eyed females are crossed to pure wildtype males,what phenotypic and genotypic ratios are expected if the F2 males are backcrossed to the sepia eyed parental females?

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