Match the genetic phenomena with their respective ratios a Inhibitory gene ratio 1 9 : 3 : 4 b Complementary gene ratio 2 1 : 1 : 1 : 1 c Recessive epistasis ratio 3 12 : 3 : 1 d Dihybrid test cross ratio 4 13 : 3 e Dominant epistasis ratio 5 9 : 7 *Note: The question has been modified here as it was incorrect in book.

a - 4 , b - 5 , c - 1 , d - 2 , e - 3

a - 5 , b - 4 , c - 3 , d - 2 , e - 1

a - 1 , b - 2 , c - 4 , d - 3 , e - 5

a - 2 , b - 1 , c - 4 , d - 5 , e - 3

Match Column I and Column II: Column I Column II A Dominant epistasis i 9 : 3 : 4 B Recessive epistasis ii 15 : 1 C Complementary genes iii 12 : 3 : 1 D Duplicate genes iv 9 : 7

A → ( iii ) , B → ( i ) , C → ( iv ) , D → ( ii )

A → ( iii ) , B → ( ii ) , C → ( i ) , D → ( iv )

A → ( iii ) , B → ( iv ) , C → ( i ) , D → ( ii )

A → ( ii ) , B → ( iii ) , C → ( iv ) , D → ( i )

EASY

Earn 100

Who first explained monogenic inheritance?

Important Questions on Principles of Inheritance and Variation

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

In a diploid organism, when the locus X is inactivated by locus Y, transcription of the locus Y is triggered. Based on this observation, which one of the following statements is CORRECT?

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

Define polygenic inheritance.

HARD

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

A woman with blood group O married a man with blood group AB. Show the possible blood groups of the progeny. List the alleles involved in this inheritance.

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

The gene which masks the effect of another gene is called.

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

Which one is an interaction of genes?

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

Which option is correct for this matching?

Column I	Column II
I. Supplementary gene	A. The gene which suppresses genes the expression of a non-allelic
II. Complementary genes	B. Gene controlling the expression of two or more characters in a dominant state
III. Epistatic gene	C. Pair of non-allelic genes where only one is able to express its effect independently in a dominant state
IV. Pleiotropic gene	D. Pair of non-allelic genes, both of which independently express similar phenotypes

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

Which one of the following genes influences the viability of the organisms when present in homozygous condition?

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

In complementary genes, the dihybrid ratio of

9 : 3 : 3 : 1

is modified to

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

In a cross between white-flowered parents, F₁ progeny was uniformly purple-flowered. The F₂progeny showed a phenotypic ratio 9 : 7 between purple-flowered and white-flowered plants. The above result indicates that the flower colour is controlled by:

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

When one gene influences the expression of another non-allelic gene it is termed as

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

Gene which in a homozygous condition results in a non-viable progeny is known as

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

The fruit shape in tomato is an example of

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

Genes that are similar in phenotypic effect when present separately, but together interact to produce a different trait give a ratio of

9 : 7

in the

F_{2}

generation. What are such genes known as?

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

Lathyrus odoratus is an example of which of the following genes

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

Match the genetic phenomena with their respective ratios

$a$	Inhibitory gene ratio	$1$	$9 : 3 : 4$
$b$	Complementary gene ratio	$2$	$1 : 1 : 1 : 1$
$c$	Recessive epistasis ratio	$3$	$12 : 3 : 1$
$d$	Dihybrid test cross ratio	$4$	$13 : 3$
$e$	Dominant epistasis ratio	$5$	$9 : 7$