The indirect Coombs test finds certain antibodies that are in the liquid part of your blood (serum). These antibodies can attack red blood cells but are not attached to your red blood cells. The indirect Coombs test is commonly done to find antibodies in a recipient's or donor's blood before a transfusion. A test to determine whether a woman has Rh-positive or Rh-negative blood (Rh antibody titer) is done early in pregnancy.
Allele frequency, or gene frequency, is the relative frequency of an allele (variant of a gene) at a particular locus in a population, expressed as a fraction or percentage. Specifically, it is the fraction of all chromosomes in the population that carry that allele.
1 The frequency of the A allele. 2  Answer: Since q = 0.6, and p + q = 1, then p = 0.4; the frequency of A is by definition equal to p, so the answer is 40%. 3  The frequencies of the genotypes AA and Aa.. 4  Answer: The frequency of AA is equal to p 2, and the frequency of Aa is equal to 2pq. The frequency of the recessive allele. 2  Answer: Since we believe that the homozygous recessive for this gene (q 2) represents 4% (i.e. = 0.04), the square root (q) is 0.2 (20%). 3  The frequency of the dominant allele. 4  Answer: Since q = 0.2, and p + q = 1, then p = 0.8 (80%).