Because there is only homozygous recessive
Answer:
He is either not carrying the gene for RP or the RP gene has mutated.
Explanation:
RP or Retina Pigmentosa is an eye defect inherited by a person from a parent. The disease is degenerative as the individual gradually loses his sight. It normally starts off as night-blindness and could go as bad as a total loss of sight.
The mutation of both the RPGR and RP2 genes which are responsible for the function and structure of light-reception in the eye accounts for most cases of Retina Pigmentosa disease.
<span><span><span>Element symbol Element name Ion symbol Cl chlorine Cl1-</span>Anion name chloride ion</span><span><span>Br bromine Br 1-</span>bromide ion</span><span><span>O oxygen O2-</span><span>oxide ion, can u make this the brainliest</span></span></span>
Transverse waves contain crests & troughs
while longitudinal waves contains compressions &rarefactions.
