what is the difference between people who are universal donor and universal recipients in terms of the antigen they contain on their red blood cells

Which would be the outcome in a fertilized egg if the process of meiosis did not occur? twice as many chromosomes as the parents half as many chromosomes as the parents same number of chromosomes as the parents triple the number of chromosomes as the parents?

To confirm when to exclude children from school it’s recommended that you refer to guidelines from which of the following organizations

Which kind of mutation has occurred when the codon for an amino acid is changed to a stop codon? a. a silent mutation b. a missense mutation c. a frameshift mutation d. a nonsense mutation