Given below are two statements: one is labelled as
Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Mendel's law of Independent assortment does not hold good for the genes that are located closely on the same chromosome.
Reason (R): Closely located genes assort independently.
In the light of the above statements, choose the correct answer from the options given below:
1. (A) is not correct but (R) is correct
2. Both (A) and (R) are correct and (R) is the correct explanation of (A)
3. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
4. (A) is correct but (R) is not correct

Subtopic:  Monohybrid Cross: 1 |

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The recombination frequency between the genes a & c is 5%, b & c is 15%, b & d is 9%, a & b is 20%, c & d is 24% and a & d is 29%. What will be the sequence of these genes on a linear chromosome?
1. a, c, b, d
2. a, d, b, c
3. d, b, a, c
4. a, b, c, d

Subtopic:  Recombination & Gene Mapping |
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If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness
1. 100%
2. 25%
3. 50%
4. 75%
Subtopic:  Pedigree Analysis: More Examples |
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Select the correct statements with respect to pleiotropism 
(a) A gene is said to be pleiotropy if it affects more than one trait 
(b) Phenylketonuria is an example of pleiotropy
(c) A condition where one gene has several alleles is referred to as pleiotropism 
(d) A trait is said to be pleiotropic if several genes control it 
Choose the correct answer from the options given below: 
1. (a) and (b) only 
2. (a) and (d) only 
3. (a), (b) and (c) only 
4. (b) ,(c) and (d) only 

Subtopic:  Polygenic Inheritance & Pleiotropy |
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Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R) 
Assertion(A): A father will never pass the gene for haemophilia to his sons 
Reason (R) : Haemophilia is sex-linked (X-linked recessive traits. 
In the light of the above statements, choose the correct answer from the options given below 
1. (A) is correct but R is not correct 
2. (A) is not correct but (R) is correct 
3. Both (A) and (R) are correct (R) is the correct explanation of (A) 
4. Both (A) and (R) are correct but (R) is not the  correct explanation of (A) 

Subtopic:  Mendelian Disorders: Hemophilia |
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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 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 |
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Assuming that fur colour of an animal is dark, range of colour shade and white. A cross is made between a male (AABBCC) with dark fur colour and a female (aabbcc) with white fur colour. What would be the fur colour of F1 generation? 
1. All intermediate colour 
2. Range of colour shade 
3. All dark colour 
4. All white colour 

Subtopic:  Polygenic Inheritance & Pleiotropy |
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In Drosophila, the genes for color of body and color of eyes are situated on _______.
1. both the sex chromosomes
2. autosomes 
3. Y-chromosome 
4. X-chromosome 

Subtopic:  Linkage | Recombination Gene Mapping |
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A low frequency recombination indicates that the genes are: 
1. Located far apart from each other 
2. Located close to each other 
3. Not linked 
4. Present on different c

Subtopic:  Linkage | Recombination Gene Mapping |
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Thomas Hunt Morgan's choice of Drosophila melanogaster has been proving to be useful even today. Which of the following has/have continued to make it a most useful species?
I. its four pairs of chromosomes
II. a very large number of visible as well as biochemically mutant phenotypes
III. easy and inexpensive maintenance
IV. short generation time and large number of offspring
1. II and III only
2. I, II, and III only
3. II, III, and IV only
4. I, II, III, and IV
Subtopic:  Chromosomal Basis of Inheritance: Introduction |
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