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%
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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%
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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%
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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%
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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%
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In which of the following male heterogamety is not observed?

(1) Insects

(2) Birds

(3) Humans

(4) (1) and (2)

Subtopic:  Sex Determination: Further Considerations |
 78%
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In which of the following female heterogamety is not observed?

(1) Insects

(2) Birds

(3) Humans

(4) (1) and (3)

Subtopic:  Sex Determination: Further Considerations |
 79%
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Which of the following matches is wrong?

(1) Birds- ZZ(male)- ZW(female)

(2) Drosophila- XY(male)- XX(female)

(3) Humans- XY (male), XX (female)

(4) Cockroach- - XZ(male)- ZZ(female)

Subtopic:  Sex Determination: Further Considerations |
 87%
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