Carla receives an allele for blue eyes from her mother, and an allele for brown eyes from her father If brown eye color is a dom
inant trait and blue eye color is a recessive trait, what can be determined about the color of Carla's eyes?A. Carla's eye color cannot be determined.B. Carla has brown eyesC. Carla has green eyesD. Carla has blue eyes
Sex-linked characters such as colour vision are determined by a gene located on the X-chromosome.
The recessive allele for brown-eyed colour was masked in Carla's mother (that is why she had blue-eyed colour), but expressed in Carla's father (reason for his brown-eyed colour)
Thus, Carla's brown-eye colour means she possess a homozygous allelic pair for the sex-linked character, since her both parents contributed X-chromosome each.
The experiment conducted in 1952 by hershey and chase consisted in the use of sulfur to track proteins and radioactive phosphorus to track DNA from T2 phages that infect bacterial cells, the key result was that phage proteins were outside the cell during the infection but the DNA was inside the cells because new phages were obtained with radioactive phosphorus. This allows us to conclude that DNA acts as a genetic material of phage T2
