ABO blood groups in humans are controlled by the gene I. It has three alleles: IA, IB, and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
Correct answer: C. Four
- A. Three
- B. One
- C. Four
- D. Two
Explanation
The three alleles IA, IB, and i of gene I in the ABO blood group system can produce six different genotypes and four different phenotypes as A , B , AB and O blood group.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Inheritance
1,238 free Inheritance MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Inheritance questions
Test cross in plants or in Drosophila involves crossing:
Which one of the following conditions correctly describes the manner of determining the sex?
When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both its parents. This phenomenon is called:
Select the correct statement from the ones given below with respect to the dihybrid cross:
Which one of the following cannot be explained on the basis of Mendel's law of dominance?
Select the incorrect statement from the following: