The phenomenon of pleiotropism refers to:
 
1. more than two genes affecting a single character.
2. presence of several alleles of a single gene controlling a single crossover.
3. presence of two alleles, each of the two genes controlling a single trait.
4. a single gene affecting multiple phenotypic expressions.
Subtopic:  Polygenic Inheritance & Pleiotropy |
 75%
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NEET - 2023
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Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by:
1.Henking 2.Thomas Hunt Morgan 
3.Sutton and Boveri 4.Alfred Sturtevant 
Subtopic:  Understanding Linkage | Linkage Types | Recombination & Gene Mapping |
 71%
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NEET - 2023
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Which of the following statements are correct about klinefelter's Syndrome?
A. This disorder was first described by Langdon Down (1866).
B. Such an individual has overall masculine development. However, the feminine development is also expressed. 
C. The affected individual is short statured.
D. Physical, psychomotor and mental development is retarded.
E. Such individuals are sterile. 
Choose the correct answer from the options given below:
1. A and E only  2. A and B only 
3. C and D only  4. B and E only
Subtopic:  Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
 79%
From NCERT
NEET - 2023
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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 |
 84%
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 |
 86%
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NEET - 2023
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 Match List - I with List - II
List - I List - II
(Type of cross) (Phenotypic ratio)
(A) Monohybrid cross (I) 1:1
(B) Dihybrid cross (II) 1:2:1
(C) Incomplete dominance (III) 3:1
(D) Test cross (IV) 9:3:3:1
Choose the correct answer from the options given below:
Options: (A) (B) (C) (D)
1. III IV II I
2. II IV III I
3. II III IV I
4. IV III I II
Subtopic:  Monohybrid Cross: Further Understanding | Dihybrid Cross: General Consideration | Dihybrid Cross: Details | Dominance Deviation from Mendel: 1 | Dominance Deviation from Mendel: 2 |
 83%
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NEET - 2023
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A heterozygous pea plant with violet flowers was crossed with a homozygous pea plant with white flowers. Violet is dominant over white. Which one of the following represents the expected combinations among 40 progenies formed?
1. 30 produced violet and 10 produced white flowers
2. 20 produced violet and 20 produced white flowers.
3. All 40 produced violet flowers
4. All 40 produced white flowers
Subtopic:  Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
 67%
From NCERT
NEET - 2023
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In which disorder, change of single base pair in the gene for beta globin chain results in change of glutamic acid to valine?
1. Thalassemia 2. Sickle cell anemia
3. Haemophilia 4. Phenylketonuria
Subtopic:  Mendelian Disorders: Sickle Cell Anemia |
 83%
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NEET - 2023
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A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The F1 plants had yellow seeds and pink flowers. The F1 plants were selfed to get F2 progeny. Assuming independent assortment of the two characters, how many phenotypic categories are expected for these characters in the F2 generation?
1. 9 2. 16
3. 4 4. 6
Subtopic:  Dihybrid Cross: General Consideration |
From NCERT
NEET - 2023
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 Select the correct statements about sickle cell anemia:
A: There is a change in the gene for beta-globin
B: In beta-globin, there is a valine in place of Lysine
C: It is an example of point mutation
D: In the normal gene, U is replaced by A
Choose the correct answer from the options given below:
1. (B), (C) and (D) only 2. (B) and (D) only
3. (A), (B) and (D) only 4. (A) and (C) only
Subtopic:  Mendelian Disorders: Sickle Cell Anemia |
 80%
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NEET - 2023
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