When can an individual have an allele for a disorder but not have the disorder??explain

Look at the punnett square for an x-linked recessive disease. is it possible for a female offspring to have the disease?

Are produced in the light reactions and used in the calvin cycle. a)nadh and atp b)electrons and sugar c)nadt+ and adp d)sugar molecules

The development of this new blg-free, hypoallergenic milk is based on a science that came to the forefront 150 years ago. what scientist's work provided the basis for such feats in biotechnology?