Answer:
In humans, blood group is determined by three alleles
,
, and
.
and
are co-dominant whereas
is recessive to other two.
Thus, if a person with blood group O produces offspring with blood group B then the other parent must contain
allele.
The genotype of other person can be
,
, or
.
There is only one condition in which the person can have offspring with blood group O that is, when the other parent is
.
In this condition, the probability of an offspring to have blood group O is 50%.
In other conditions, the probability of an offspring to have blood O is 0%.
By the change of environment , by the process
I believe the answer is true
Answer:
Hepatitis A
Explanation
Hepatitis A is caused by is caused by Hepatitis A virus which infects the liver and causes an inflammation.
The virus for Hepatitis A is spread through eating or drinking something contaminated with fecal matter and it is highly contagious.
However, it is preventable by vaccination.
Since it is a food borne disease which is highly contagious, a food handler has to be excluded from operation and a medical practitioner has to determine when the person can resume to avoid further transmission.