Determine the genotypes of the parents. We know that the female is homozygous dominant for both traits. What is her genotype?





The male is also homozygous for both traits but he is recessive. So, what does this make the male's genotype?





Now that you have the genotypes of the parents, perform a punnett square to determine what the F1 offspring would be (remember to place the gametes of one parent across the top and the gametes of the other parent down the left side. It does not matter which parent's gametes are placed across the top and which are placed down the side.):





Your punnett square should look similar to the one below. If it does not, review the material on gamete formation and how to set up the punnett square and try again.

FS FS FS FS
fs FfSs FfSs FfSs FfSs
fs FfSs FfSs FfSs FfSs
fs FfSs FfSs FfSs FfSs
fs FfSs FfSs FfSs FfSs


Now simply count up the number of offspring of each genotype and phenotype produced.




Return to the question page and select the correct answers.




To find the genotypic ratio of the F2 generation, cross two of the individuals from the F1 generation. All of these carrion beetles had genotypes of FfSs. Below is a blank punnett square in which you can make the F2 cross.





Your punnett square should look similar to the one below. If it does not, review the material on gamete formation and how to set up the punnett square and try again.

FS Fs fS fs
FS FFSS FFSs FfSS FfSs
Fs FFSs FFss FfSs Ffss
fS FfSS FfSs ffSS ffSs
fs FfSs Ffss ffSs ffss


Now count up the number of offspring of each genotype and produced.




Return to the question page and select the correct answers.