Answer:
<u>Answer to Question 1:</u>
Sickle cell anemia is a recessive disorder. The fact that one of their children is a carrier means that either of Keith and Marsha is a carrier ot it might be that both of them are carriers of the disease.
<u>Answer to Question 2:</u>
The other two kids of Jeff and Adrienne who don't have the genetic disease are still carriers of sickle cell anemia.
<u>Answer to Question 3:</u>
Adrienne is a carrier of the sickle cell anemia disease as well, just like Jeff.
Hope that answers the question, have a great day!
Answer:
(1) Nitrite poisoning
(2) Its cause is elevated levels of nitrite in the pond or culture system water.
