Question

Which of the following characteristics represent ‘Inheritance of blood groups’ in humans ?
a. Dominance
b. Co-dominance
c. Multiple allele
d. Incomplete dominance
e. Polygenic inheritance

• A. b, c and e
• B. b, d and e
• C. a, b and c
• D. a, c and e

Answer 1

The Correct Option is C

The inheritance of blood groups in humans is determined by multiple genetic concepts. Let's evaluate each of the given characteristics to identify which apply:

1. Dominance: Blood groups are inherited in a dominant manner. For example, the blood group A can be either AA or AO, where A is dominant over O.
2. Co-dominance: This is a key feature of blood group inheritance, especially seen in the AB blood group. Here, both A and B alleles are equally expressed, showing co-dominance.
3. Multiple Allele: The ABO blood group system is determined by three alleles: A, B, and O. Thus, it demonstrates the concept of multiple alleles.

Let's analyze the incorrect options:

1. Incomplete Dominance: This occurs when the phenotype of heterozygotes is intermediate between the two homozygotes. This does not apply to blood group inheritance.
2. Polygenic Inheritance: This involves multiple genes contributing to a single phenotype. Blood groups are not a result of polygenic inheritance as they are determined by a single locus with multiple alleles.

Based on the above explanations, the characteristics that represent the inheritance of blood groups in humans are Dominance, Co-dominance, and Multiple Allele. Therefore, the correct answer is:

Option: a, b and c