What are the genotypes of the parents in the monohybrid cross below if the following offspring genotypes are predicted?

tt and tt
tt and tt
tt and tt
tt and tt

As you can see in the diagram presented below, the correct genotypes of the parents are TT and Tt.

Each parent give its children only one chromosome of the chromosome pair, therefore only one allele of the gene.

In our case, TT and Tt is the correct answer because one of the parents has to have the t allele to give to the Tt offspring.

But if both of the parents were Tt, one of the offspring would have tt genotype, and if the parents were TT and tt, all of the offspring would be Tt. Therefore, the TT x Tt combination is the only possible answer.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.