In chickens, gene R produces a rose-shaped comb, gene r produces a single comb, gene P produces pea-shaped comb and gene p produces a single comb. When P and R are both present in the genotype, the comb is walnut shaped. Two chickens with genotype RrPp are intercrossed. What will be the ratio of Walnut shaped, Rose shaped, Pea shaped and single comb progeny respectively:

(1) 3 : 1 : 1 : 3

(2) 1 : 1: 1 : 1

(3) 9 : 3 : 3 : 1

(4) 12 : 3 : 4

Subtopic:  Polygenic Inheritance & Pleiotropy |
 66%
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Two pure lines of corn have mean cob lengths of 9 and 3 inches respectively. The polygenes involved in this trait all exhibit additive gene action. Crossing these two lines is expected to produce a progeny with mean cob length [in inches] of:

(1) 12.0

(2) 7.5

(3) 6.0

(4) 2.75

Subtopic:  Polygenic Inheritance & Pleiotropy |
 58%
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Diseases that are caused by the malfunction of a pleiotropic gene are:

(1) cured by dietary restrictions

(2) reversible by gene therapy

(3) called as syndromes

(4) extremely rare

Subtopic:  Polygenic Inheritance & Pleiotropy |
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Out of a pair of monozygotic twins, one develops hare lip and the other does not. This can be an example of the genetic phenomenon of:

(1) Pleiotropy

(2) Incomplete penetrance

(3) Variable expressivity

(4) Incomplete dominance

Subtopic:  Conclusion |
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The mapping of genes on chromosome was attempted by

(1) T. H. Morgan

(2) Walter Sutton

(3) Alfred Sturtevant

(4) Henking

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
 79%
From NCERT
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Today ________ are extensively used as a _______ point in the sequencing of whole genome

(1) Pedigree charts, conclusive

(2) Genetic maps, starting

(3) Pedigree charts, starting

(4) Genetic maps, conclusive

Subtopic:  Recombination Gene Mapping |
 68%
From NCERT
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The initial studies for sex determination were done over

(1) Plants

(2) Insects

(3) Humans

(4) Hen

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
 83%
From NCERT
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The concept of X body was given by

(1) T. H. Morgan

(2) Walter Sutton

(3) Alfred Sturtevant

(4) Henking

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
 85%
From NCERT
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Which of the following statements are correct regarding Chromosomal basis of sex determination?

(i) The mechanism of sex determination in insects is of XO type.

(ii) XX insect is female while XO insect is male.

(iii) The X chromosome is called sex chromosome because it was involved in sex determination.

(iv) Grasshopper has XY type of sex determination.

(v) Man has XX type of sex determination.

(1) (iv), (v)

(2) (i), (ii), (iii), (iv), (v)

(3) (i), (ii), (iii)

(4) (i), (iv), (v)

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
 88%
From NCERT
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Among human males _______ chromosome is present but its counterpart is _____ and called ______ chromosome.

(1) Y, bigger, Z

(2) X, smaller, Z

(3) X, smaller, Y

(4) Z, bigger, X

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
 87%
From NCERT
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