In sailfin mollies (a king of fish), gold color is due to an allele (g) that is

Question

In sailfin mollies (a king of fish), gold color is due to an allele (g) that is recessive to the allele for normal color (G). a gold fish is crossed with a normal fish. Among the offspring 88 are normal and 82 are gold.

A. What are the most likely genotypes of the parents in this cross?

B. Assess the plausibility of your hypothesis by performing a chi-square test.

I don't know if i'm allowed two part question but I put it, if you can put how to solve this problem I will study it, I don't need very complicated explanation, I can learn it quickly. Thanks!

Explanation / Answer

gold fish: gg

normal color: GG or Gg

when a normal and gold fish are crossed we got both normal and gold fish.so the genotype of the normal fish must be heterozygote since gold is a recessive trait and the offsprings are in 1:1 ratio(similar to the given data)

if the normal was a homozygote we would not get any gold fish in the offspring

Test for goodness of fit:

Null hypothesis:1:1

note:0.5 is yates correction.

level of significance=5%

degree of freedom:2-1=1

Conclusion:The calculated value of X2 is 0.14 which is less than the tabulated value at df 1 i.e 3.84.So the null hypothesis is accepted.

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