The amino acid composition of the relevant portion of the β chain of two haemoglobin molecules (a and B) are shown below: Which one of the polypeptide chains is abnormal. What is the effect of this abnormality in such individuals?

Chain A is the normal polypeptide β chain for haemoglobin and Chain B is abnormal. In this chain, the sixth amino acid glutamate is replaced by valine. This is caused by a mutation (substitution) in the haemoglobin chain that results in the disorder called Sickle cell anaemia. The RBC's become sickle-shaped and their oxygen-carrying capacity is affected.

The amino acid composition of the relevant portion of the B chain of two haemoglobin molecules (a and B) are shown below: Which one of the polypeptide chains is abnormal. Name the disorder caused by it.

Chain A is the normal polypeptide β chain for haemoglobin and Chain B is abnormal. In this chain, the sixth amino acid glutamate is replaced by valine. This mutation in the haemoglobin chain results in the disorder called Sickle cell anaemia.

The amino acid composition of the relevant portion of the β chain of two haemoglobin molecules (a and B) are shown below: Which one of the polypeptide chains is abnormal. What is the reason of this abnormality?

Chain A is the normal polypeptide β chain for haemoglobin and Chain B is abnormal. In this chain, the sixth amino acid glutamate is replaced by valine. This is caused by mutation (substitution) in the haemoglobin chain that results in the disorder called Sickle cell anaemia.

controls multiple traits in an individual.

is a gene evolved during Pliocene.

controls a trait only in combination with another gene.

is expressed in only primitive plants.

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Choose the incorrect statement w.r.t. polygenic inheritance.

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Important Questions on Heredity and Variation

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

Match the terms in Column-I with their description in Column-II and choose the correct option:

Column – I	Column – II
(a) Dominance	(i) Many genes govern a single character
(b) Codominance	(ii) In a heterozygous organism, only one allele expresses itself
(c) Pleiotropy	(iii) In a heterozygous organism, both alleles express themselves fully
(d) Polygenic inheritance	(iv) A single gene influences many characters

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

The amino acid composition of the relevant portion of the $β$ chain of two haemoglobin molecules (a and B) are shown below:

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Which one of the polypeptide chains is abnormal. What is the effect of this abnormality in such individuals?

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

Which of the following pairs is wrongly matched?

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

Multiple alleles are present:

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

Define polygenic inheritance.

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

Which of the following characteristics represent 'Inheritance of blood groups' in humans?
i. Dominance
ii. Co-dominance
iii. Multiple alleles
iv. Incomplete dominance
v. Polygenic inheritance

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

The best example for pleiotropy is:

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

The amino acid composition of the relevant portion of the $β$ chain of two haemoglobin molecules (a and B) are shown below:

Question Image

Which one of the polypeptide chains is abnormal?

HARD

Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

The amino acid composition of the relevant portion of the B chain of two haemoglobin molecules (a and B) are shown below:

Question Image

Which one of the polypeptide chains is abnormal. Name the disorder caused by it.

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

The genotypes of a Husband and Wife are

I^{A} I^{B}

and

I^{A} i

.
Among the blood types of their children, how many different genotypes and phenotypes are possible?

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

If one gene influences many phenotypic traits, the phenomenon is called

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F₁ generation, pink flowers were obtained. When pink flowers were selfed, the F₂ generation showed white, red and pink flowers. Choose the incorrect statement from the following.

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

A gene showing codominance has

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

A man with blood group A marries a woman having blood group. The maximum possible blood groups among their progenies are

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

In a mating between two mulattos, each heterozygous at all three gene loci for the skin colour, what is the chance their child will have very light skin?

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Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

The amino acid composition of the relevant portion of the $β$ chain of two haemoglobin molecules (a and B) are shown below:

Question Image