Allele IA specifies the production of antibodies:
Correct answer: B. Against B
- A. Against A
- B. Against B
- C. Against A and B
- D. Against O
Explanation
The correct answer is 'Against B'. Allele IA indicates the presence of antigen A on the surface of red blood cells. As a result, individuals with this allele do not produce antibodies against A, but they do produce antibodies against B, since they lack antigen B. Option A is incorrect because individuals with allele IA do not produce antibodies against A. Option C is incorrect because antibodies against both A and B are produced by individuals with blood type O, who lack both antigens. Option D is incorrect because there are no specific antibodies produced against blood type O.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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