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 |
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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 |
 90%
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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 |
 88%
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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 |
 85%
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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 |
 82%
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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 |
 86%
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Which of the following statement is correct with respect to human sex determination?

(1) The genetic makeup of egg determines the sex of child.

(2) Female produces two types of ovums and males produce only one type of sperm.

(3) Each pregnancy has more probability of male child than of female.

(4) Out of 23 pairs of chromosomes, 22 are same both in males and females.

Subtopic:  Sex Determination |
 92%
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Mutation causes

(1) alterations at protein level

(2) changes in genotype only

(3) changes in phenotype

(4) both (2) and (3)

Subtopic:  Mendelian Disorders |
 89%
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Sickle cell anaemia is a classic example of

(1) Point mutation

(2) silent mutation

(3) Frame shift mutation

(4) non sense mutation

Subtopic:  Mendelian Disorders: Sickle Cell Anemia |
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In which of the following one may observe variation in DNA?

(1) Fragmentation

(2) Budding

(3) Amitosis

(4) mutation

Subtopic:  Mendelian Disorders |
 96%
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