Answer:
Mitochondrial Disorder
Explanation:
The LHON stands for leber hereditary optic neuropathy is a type of mitochondrial disorder. The disorder is generally observed in young males. The mitochondrial disorder are transferred from mother to its progeny. The disorder causes retinal ganglion cells (RGCs) and the exons of RGCs to degenerate. The disorder causes sudden painless failure of vision. The disorder leads to loss of central vision, optic atropy and central scotoma.
The most of the individuals with LHON do not possess the signs of the disorder. The disorder is caused by mutation in maternal DNA, thus it is a type of mitochondrial disorder.
D. 99% of all living things that have ever existed are now extinct
If the sperm gametes that fertilizes an egg has an XX chromosomes, it will form female offspring. X is a female, XY is a female, Y is a male and XX is a female.
The three observations that could help an individual in distinguising whether the organism is a fish or not is that it should live under water as fish can't survive without water, another thing is that it should laid eggs when it comes to giving birth because when it does not lay eggs but produces a living organism normally without an egg, it is considered to be a mammal and lastly, the appearance it possess such as having gils or fins.
