Which genetic disorder is caused by a sex-linked gene?

The allele for red flowers and the allele for white flowers in a plant show codominance; the heterozygous being pink. Which phenotypic ratio could be expected in the offspring from a cross between heterozygous pink flower plants?

A heterozygous red-eyed fruit fly is crossed with a white-eyed fruit fly. The allele for the red eye is dominant to the allele for the white eye. What is the probability of producing offspring with white eyes?

In pea plants, the allele S for smooth seed is dominant to the allele for wrinkled seed. 200 heterozygous plants are self-pollinated and 1500 smooth seeds are produced. How many wrinkled seeds are also produced?

In fruit flies, the long-winged flies were self-mated. Out of 520 offspring, 130 had short wings while the remainder has long wings. The allele for long wings is dominant (W) and allele (w) represents short wings. Which is the correct pair of genotypes of the parents?

A particular characteristic is controlled by allele H and h. What are the possible genotypes of the offspring from a cross between homozygous dominant and homozygous recessive parents?