XO type of sex determination can be found in:
1. Monkeys
2. Drosophila
3. Birds
4. Grasshoppers

Subtopic:  Sex Determination |
 84%
From NCERT
NEET - 2022
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Given below are two statements:

Statement I: Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance
Statement II: Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height

In the light of the above statements, choose the correct answer from the options given below:
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.

Subtopic:  Introduction to Genetics: 2 |
 85%
From NCERT
NEET - 2022
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Match List-I with List-II

List-I List-II
(a) Haemophilia (i) Inborn error of metabolism which lacks an enzyme that converts phenylalanine into tyrosine
(b) Down's Syndrome (ii) Sex-linked recessive disorder; a defect in blood coagulation
(c) Phenylketonuria (iii) Presence of additional copy of X-chromosome  (44+XXY)
(d) Klinefelter's Syndrome (iv) Additional copy of chromosome number 21

Choose  the correct answer from the options given below:

(a) (b) (c) (d)
1. (ii) (iv) (i) (iii)
2. (iv) (ii) (i) (iii)
3. (ii) (iii) (i) (iv)
4 (i) (ii) (iii) (iv)
Subtopic:  Mendelian Disorders | Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
 88%
From NCERT
NEET - 2022
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The chromosomal theory of inheritance was proposed by:
1. Thomas Morgan
2. Sutton and Boveri
3. Gregor Mendel
4. Robert Brown
Subtopic:  Chromosomal Basis of Inheritance: Introduction |
 84%
From NCERT
NEET - 2022
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If a female individual is with small round head, furrowed tongue, partially open mouth and broad palm with characteristic palm crease. Also the physical, psychomotor and mental development is retarded. The karyotype analysis of such an individual will show :
1. 47 chromosomes with XXY sex chromosomes
2. 45 chromosomes with XO sex chromosomes
3. 47 chromosomes with XYY sex chromosomes
4. Trisomy of chromosome 21
Subtopic:  Non - Disjunction & Aneuploidy |
 86%
From NCERT
NEET - 2022
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Select the incorrect match regarding the symbols used in Pedigree analysis:
1. Sex unspecified
2. Affected individual
3. Consanguineous mating
4. Parent with male child affected with disease
Subtopic:  Pedigree Analysis: Basics |
 86%
From NCERT
NEET - 2022
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Genetic variation in a population arises due to:
1. Recombination only
2. Mutations as well as recombination
3. Reproductive isolation and selection
4. Mutations only
Subtopic:  Mutation |
 87%
From NCERT
NEET - 2013
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Down's syndrome in humans is due to:
1. Three 'X' chromosomes
2. Three copies of chromosome 21
3. Monosomy
4. Two 'Y' chromosomes
Subtopic:  Non - Disjunction & Aneuploidy |
 89%
From NCERT
NEET - 2013
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Broad palm with single palm crease is visible in a person suffering from-
1.Thalassemia2.Down's syndrome
3.Turner's syndrome4.Klinefelter's syndrome
Subtopic:  Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
 88%
From NCERT
NEET - 2023
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Which one of the following symbols represents mating between relatives in human pedigree analysis?
1. 2.
3. 4.
Subtopic:  Pedigree Analysis: Basics |
 89%
From NCERT
NEET - 2023
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