Inheritance of vision disorders?

Question

If the mother is very nearsighted, what are the chances her children will have vision problems if:

a. the father has perfect vision
b. the father is nearsighted
c. the father is farsighted

If you can recommend a website for me to look this up at, I'd be grateful. Thanks!

Answer 1

The answer depends on whether the gene is dominant or recessive. Myopia (nearsightedness) can be a problem with any one of a number of genes, and has been shown to be either recessive or dominant depending on what gene is mutated. There has been a lot of evidence for dominant inheritance though.

If the gene is dominant:
a. 50% (either the child inherits the gene or he/she doesn't)
b. 75% (the child would need two copies of the normal gene, and each parent has only one)
c. 75% (assuming the farsighted gene is also dominant...this would make the child nearsighted, farsighted, or both, unless he/she received two copies of the normal gene)

Answer 2

It all depends on the alleles but because the nearsighted or longsighted seems to be a mutation or next generation the perfect vision will be the dominant allele.

a=0% imposiible the perfect sight allele is the dominant one
b=100 is going to be nearsighted
c=imposible to tell as you dont know which one is the dominant allele.If both parents were hetrozygous the children could even well have perfect sight

Answer 3

let's use common sense and basic genetics. the kid is getting basic gene sequence from both sources so it's all aobut what is dominant. i'll leave that to you