Question

If two parents have an autosomal recessive trait, what can we say about the transmission of the trait to their children?

Answer 1

For these type of problem just do analysis of pedigree,by considering the genotypes.

If the both the parent were having autosomal recessive trait that means their genotype would have been `Aa` where,`A` stands for chromosome carrying normal dominant gene and `a` for the chromosome carrying recessive gene for the disease.

So,out of the `4` children `3` get the recessive gene but only `1` is the sufferer,

So,probability of suffering from this disease is `1/4`