Huntington’s disease is inherited in an autosomal dominant pattern. what was the probability of children #1 and #2 inheriting the disorder, and did child #3 have a chance to get huntington’s disease?

C. child #1 and #2 each had a 50% chance of getting HD; child #3 had a 0% chance.

Huntington’s disease is inherited in an autosomal dominant pattern which means you only need one allele from any parents to get the disease. That also means that there is no carrier, a healthy person must not carry any of the genes. 

Parent of child 1 and 2 is a healthy male and female with HD. If the female has 2 HD gene, all of her children will get HD. But since she has a few normal children, then she must be heterozygous. Child of one heterozygous parent has 50% to get HD. 

Since child 1 is normal, there is no chance for child 3 to get HD.

The genetic variation between humans and orangutans is the greatest.

Explanation:

Humans and orangutans are farthest from each other in the tree, indicating the greatest biomolecular differences or genetic variations. The branches tell us that there are genetic differences; we cannot say from the tree that the amount of differences are equal.