A child with mother of blood group A and father of blood group AB, will not have which of the following blood group?
- A
- B
- AB
- O
The Correct Option is D
Solution and Explanation
- The ABO system encompasses four primary blood groups: A, B, AB, and O
- Each characterized by specific antigens.
- Blood type A carries antigen A, blood type B carries antigen B, blood type AB carries both antigens, while blood type O lacks any antigen.
- The inheritance of blood groups is governed by the ABO gene.
- When a child inherits one or more alleles for A, B, or O, they belong to one of the four blood groups: A, B, AB, or O.
- Allele O is considered recessive, whereas alleles A and B are codominant.
- During inheritance, the child receives one ABO allele from each parent.
- For instance, the following table demonstrates the potential blood types inherited by a child from their parents:
As per the table, it can be concluded that a child born to a mother with blood type A and a father with blood type B will not have blood group O.
So, the correct option is (D): O
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Concepts Used:
Principles of Inheritance and Variation - Mutation
A Mutation is a change in the sequence of our DNA base pairs caused by numerous environmental stimuli such as UV light or mistakes during DNA replication. Germline mutations take place in the eggs and sperm and can be passed onto offspring, whereas somatic mutations take place in body cells and are not passed on.
Types of Mutations
There are three types of mutations, which are as follows:
Silent mutation
It refers to any change in DNA sequence that has no effect on the amino acid sequence in a protein or the functions that a protein performs. There is no phenotypic indication that a mutation has occurred.
Nonsense mutation
When there is a change in the sequence of base pairs due to a point mutation, that results in a stop codon. This leads to a protein that is either shortened or non-functional.
Missense mutation
A missense mutation occurs when a point mutation causes a change in the codon, which then codes for another amino acid.
The mutation is caused by the following factors:
Internal Causes
When DNA copies incorrectly, the majority of mutations occur. Evolution occurs as a result of all of these mutations. DNA makes a copy of itself during cell division. When a copy of DNA isn't flawless, it's called a mutation since it differs somewhat from the original DNA.
External Causes
When certain chemicals or radiations are used to break down DNA, it causes the DNA to break down. The thymine dimers are broken by UV radiation, resulting in altered DNA.