What Is the Genetic Distance Between Gene S and Gene C Biology Questions

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  genetic questions 

In snails, Gene S controls body size. The alleles for gene S are s+ (wildtype) and s- (an amorph). The wild-type phenotype is a fat body and the mutant phenotype is a thin body. 

A second gene, Gene C, controls shell color. The alleles for gene C are c+ (wildtype) and c- (an hypomorph). The wild-type phenotype is a brown shell and the mutant phenotype is a white shell

Gene S and Gene C are linked but the cM between them is unknown  

Question 2:

You cross a double homozygous wildtype snail to a double homozygous mutant snail. What are the genotypes, phenotypes and frequencies of the offspring of this cross?

QUESTION 3:

You cross the offspring from question 2 to a double homozygous mutant snail. What are the genotypes of the offspring? 

QUESTION 4

You count the offspring from the test cross from question 3 and get the following numbers:
20 thin body and brown shell
173 fat body and brown shell
21 fat body and white shell
177 thin body and white shell

QUESTION 5
What is the genetic distance between Gene S and Gene C ?   

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