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What Are Alleles

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Question

If there are four allelic form of the gene controling ABO blood group then what will be the number of possible genotype?

A

6

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B

10

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C

12

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D

14

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Solution

The correct option is A 6
ABO blood group is the classification of different blood types in humans. The blood types in humans is controlled by three alleles I^A, I^B and I. I^A and I^B are complementary to each other and dominant over i . The different genotypes possible through various combinations of alleles is shown in the figure.
So, the correct answer is '6'.

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Similar questions

Q. ABO blood grouping is controlled by gene I which has three alleles and show codominance. There are six genotypes. How many phenotypes are possible?

Q. Choose the correct answer from the alternatives given.

ABO blood groups in human beings are controlled by the gene l. The gene l has three alleles

I^{A}, I^{B}

i

. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

Q. ABO blood groups in humans are controlled by the gene I. It has three alleles-

I^{A}

I^{B}

and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

Q. ABO blood groups in humans are controlled by the gene I. There are six different genotype and four different phenotype in human population. What is the ratio of allele in sperm and population ?

Q. (a) List the three different allelic forms of gene '

I

' in humans. Explain the different phenotypic expressions, controlled by these three forms.
(b) A woman with blood group '

A

' marries a man with blood group '

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'. Discuss the possibilities of the inheritance of the blood groups in the following starting with 'yes' or 'no' for each:
(i) They produce children with blood group "A" only.
(ii) They produce children some with '

O

' blood group and some with '

A

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