El cabello oscuro en los humanos es dominante respecto al cabello pelirrojo, y el color pardo de los ojos domina sobre el azul. Un hombre de ojos azules y cabello oscuro se emparejó con una mujer de pel oscuro y ojos azules. Tuvieron dos hijos: uno de ojos pardos y pelirrojo y otro de ojos azules y pelo oscuro. Indica razonadamente cuáles son los genotipos de los padres y los hijos.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

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.