(B) Statement $(1)$ is correct because it describes the phenomenon of pleiotropy,where a single gene influences multiple phenotypic traits.Statement $

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(B) Statement $(1)$ is correct because it describes the phenomenon of pleiotropy,where a single gene influences multiple phenotypic traits.Statement $(2)$ is incorrect. The $AB$-blood group in humans is an example of co-dominance,but it is regulated by multiple alleles $(I^A, I^B, i)$,not just one dominant and one recessive allele. Specifically,$I^A$ and $I^B$ are co-dominant,and $i$ is recessive.

Class 12 Biology Principles of Inheritance and Variation Pleiotropy

Easy

Find the correct statement.
$(1)$ Generally a gene regulates a trait,but sometimes one gene has an effect on multiple traits.
$(2)$ The trait $AB$-blood group of man is regulated by one dominant allele and another recessive allele. Hence it is co-dominant.

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A
Both the Statements are wrong.
B
Statement $(1)$ is correct.
C
Statement $(2)$ is correct.
D
Both Statements $(1)$ and $(2)$ are correct.

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Chapter

Principles of Inheritance and Variation

Subtopic

Pleiotropy

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In $Drosophila$,the gene for white eye mutation is also responsible for the depigmentation of body parts. Thus,a gene that controls several phenotypes is called:

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Observe the phenotypic effects of a gene with $2$ alleles $B$ and $b$ in pea plant.
Genotype Starch grain size and Seed shape
$BB$ Large,Round
$Bb$ Intermediate,Round
$bb$ Small,Wrinkled

Which of the following is incorrect in concern to above facts $:-$

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$A$ single gene exhibits more than one phenotypic expression. This phenomenon is known as:

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$A$ single gene can exhibit multiple phenotypic expressions; this is called.....

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$A$ : Myotonic dystrophy is caused by a recessive mutant pleiotropic gene.
$R$ : Gene mutation leads to more synthesis of fibrillin proteins.

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Genotype	Starch grain size and Seed shape
$BB$	Large,Round
$Bb$	Intermediate,Round
$bb$	Small,Wrinkled

Find the correct statement.$(1)$ Generally a gene regulates a trait,but sometimes one gene has an effect on multiple traits.$(2)$ The trait $AB$-blood group of man is regulated by one dominant allele and another recessive allele. Hence it is co-dominant.

Similar Questions

In $Drosophila$,the gene for white eye mutation is also responsible for the depigmentation of body parts. Thus,a gene that controls several phenotypes is called:

Observe the phenotypic effects of a gene with $2$ alleles $B$ and $b$ in pea plant.GenotypeStarch grain size and Seed shape$BB$Large,Round$Bb$Intermediate,Round$bb$Small,WrinkledWhich of the following is incorrect in concern to above facts $:-$

$A$ single gene exhibits more than one phenotypic expression. This phenomenon is known as:

$A$ single gene can exhibit multiple phenotypic expressions; this is called.....

$A$ : Myotonic dystrophy is caused by a recessive mutant pleiotropic gene.$R$ : Gene mutation leads to more synthesis of fibrillin proteins.

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Find the correct statement.
$(1)$ Generally a gene regulates a trait,but sometimes one gene has an effect on multiple traits.
$(2)$ The trait $AB$-blood group of man is regulated by one dominant allele and another recessive allele. Hence it is co-dominant.

Observe the phenotypic effects of a gene with $2$ alleles $B$ and $b$ in pea plant.
Genotype Starch grain size and Seed shape
$BB$ Large,Round
$Bb$ Intermediate,Round
$bb$ Small,Wrinkled

Which of the following is incorrect in concern to above facts $:-$

$A$ : Myotonic dystrophy is caused by a recessive mutant pleiotropic gene.
$R$ : Gene mutation leads to more synthesis of fibrillin proteins.