Affected Unaffected Hh mother hh fathe Hh Hh hh hh Affected

Affected Unaffected Hh mother hh fathe Hh Hh hh hh Affected Unaffected children children

Solution

1.The pedigree showing in the question is related to Autosomal dominat disorder because:

i).the trait is not skipping generation.

ii). An affected person mating with an unaffected person and producing approximately 50% affected offsprings and it is also indiating that the affected individual should be a heterozygous and this is what given in the above pedigree.

ii). distribution of the trait is not limited to sex it means it is eqully distributed in the male and female offsprings.

2. Second part of the question showing that a healthy (hh) male with recessive allele is mating with the healthy(hh) female with the recessive allele then there will not be any disorder in their offspring because the disorder is Autosomal dominant and to get affected offspring atleast one parent should be hetrozygous(Hh).

3. If both the parents are affected (Hh) as shown in the question then according to law of segregation four gametes will form which are

HH, Hh, Hh, hh

since the disorder is automal dominant, the ratio of affected verses unaffected offsprings will be 3:1 it means 75% of the offsprings will be affected