Single Choice

Which pair of features represents polygenic inheritance?

AHuman eye colour and sickle cell anaemia
BHair pigment of mouse and tongue rolling in humans
CABO blood groups in humans and flower colour of Mirabilis jalapa
DHuman height and skin colour
Correct Answer

Solution

A polygenic trait is the one that is governed by more than one gene. Human skin colour is a polygenic trait governed by more than one gene where dominant allele of each gene express only a part of trait and the full trait is expressed only in the presence of dominant alleles of all multiple genes, is called polygenic inheritance. These genes control skin pigmentation only, no other phenotypic trait is affected by these genes. Likewise, human eye colour and hair pigment in the mouse are polygenic but tongue rolling in humans is not polygenic.
Human blood group inheritance is the example of codominance and multiple alleles. It is governed by three alleles namely $$I^A$$, $$I^B$$ and i. Flower color in Mirabilis jalapa is governed by two alleles of a gene that show incomplete dominance.
Sickle cell anaemia is governed by two alleles of a gene $$ Hb^b$$ and $$Hb^s$$.
Therefore, the correct answer is option D.

SIMILAR QUESTIONS

Genetics

Which one of the following best describe polygenic inheritance?

Genetics

Match column I with column II and select the correct option from the given codes. Column I Column II A. Multiple alleles (i) Phenylketonuria in Humans B. Polygenes (Multiple genes) (ii) Blood groups in humans C. Pleiotropic (iii) Skin color in humans

Genetics

Number of genotypes produced when individuals of genotype 'YyRrTt' are crossed with each other is

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How many types of gametes are expected from the organism with genotype AABBCC?

Genetics

When AABBcc is crossed with AaBbCc then the ratio of hybrid for all the three genes is

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A dihybrid ratio of 1 : 4 : 6 : 4 : 1 is obtained instead of 9 : 3 : 3 : 1. This is an example of

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An example of the quantitative trait in man is

Genetics

Polygenic inheritance was first noted by

Genetics

A polygenic inherited trait is controlled by three pairs of genes. Two individuals which are heterozygous for three alleles, are crossed with each other. What will be the phenotypic ratio of offspring?

Genetics

In a plant, three dominant independently assorting genes A, B and C are essential for production of purple pigment. If any of the genes or all three genes are present in recessive condition then flower is colourless. Raw material $$\overset { A }{ \rightarrow} X \overset { B }{ \rightarrow} Y \overset { C }{ \rightarrow} Z$$ pigment A purple plant with genotype AABBCC cossed with a clourless plant with genotype aabbcc gives purple $$F_1$$ hybrid. On selfing of $$F_1$$, what will be the proportion of coloured offspring in $$F_2$$?

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