Principles of Inheritance and Variation · Question 42

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

1. 100%
2. 50%
3. 75%
4. 25%

Experimental verification of the chromosomal theory of inheritance was done by

1. Sutton
2. Mendel
3. Morgan
4. Boveri

Select the correct match

1. Thalassemia – X linked
2. Sickle cell anaemia – Autosomal recessive trait, chromosome-11
3. Phenylketonuria – Autosomal dominant trait
4. Haemophilia – Y linked

Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.

1. Allele ‘i’ does not produce any sugar.
2. The gene (I) has three alleles.
3. When IA and IB are present together, they express same type of sugar.
4. A person will have only two of the three alleles.

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

1. 14
2. 4
3. 2
4. 8

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by :

1. Alfred Sturtevant
2. Gregor J. Mendel
3. Sutton Boveri
4. T.H. Morgan

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink flowers. Choose the incorrect statement from the following :

1. Ratio of F2 is 14 (Red) : 24 (Pink) : 14 (White)
2. Law of Segregation does not apply in this experiment
3. This experiment does not follow the Principle of Dominance
4. Pink colour in F1 is due to incomplete dominance

What map unit (Centimorgan) is adopted in the construction of genetic maps?

1. A unit of distance between genes on chromosomes, representing 1\% cross over.
2. A unit of distance between genes on chromosomes, representing 50\% cross over.
3. A unit of distance between two expressed genes, representing 10\% cross over.
4. A unit of distance between two expressed genes, representing 100\% cross over.

What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile?

1. Edward syndrome
2. Down’s syndrome
3. Turner’s syndrome
4. Klinefelter’s syndrome

Select the incorrect statement.

1. In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.
2. Human males have one of their sex-chromosome much shorter than the other.
3. Male fruit fly is heterogametic
4. In male grasshoppers, 50\% of sperms have no sex-chromosome.