Given the autosomal recessive nature of the transmission of this disease, the probability of giving birth to a sickle cell child is 100% if both parents are sick with sickle cell disease, 50% if one of the parents is sickle cell while the other carries the sickle cell trait, 25% if both parents carry the sickle cell trait, and is zero if one parent is healthy - even if the other parent is sickle cell.
It is an inherited disease and a person who receives a gene for sickle cell disease from one parent and a normal gene from another parent leads to the condition called sickle cell trait. There are one in four which is about 25% chance that any given child could be born with sickle cell anemia if both the parents have sickle cell trait but there are also possibilities that one in four could be unaffected. There is a 50% chance that any given child will get the sickle cell trait therefore, it is possible to test the hemoglobin of an unborn baby.
Enzymes are chemical catalysts they speed up/ increase the rate of the reaction by lowering the activation energy (minimum energy required for reaction to actually occur).
The correct answer is: B) As land plants became more complex, animal life did as well.
This is because land could not be colonized by other organisms such as animals until land plants became established-there was nothing for animals to feed on.
So, plants were one of the earliest organisms to leave the water and colonize land.
