Jeff's father has Huntington disease, which is caused by a rare autosomal dominant allele (H ). Two-thirds of people with the dominant Huntington allele show no symptoms by age 50, and Jeff is 50 and has no symptoms. Jeff's wife is is pregnant. What is that chance that Jeff's child will eventually show symptoms of Huntington disease?

a. 1/8
b. 1/4
c. 1/5
d. 1/6
e. 1/12
f. 1/24
g. 2/3

Which one?

g. 2/3

Explanation:

Huntington disease is a autosomal dominant disorder. This disorder can be inherited and there is 50% chance that a child may get infected from his father's disorder. Jeff is 50 and has not shown any disorder symptoms. There are 2/3 people who do not show any symptoms before age of 50. Therefore there is 2/3 chance that Jeff will eventually show symptoms of Huntington disorder.

wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.