Principles of Inheritance and Variation · Question 47

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.

Which of the following pairs is wrongly matched?

1. Starch synthesis in pea : Multiple alleles
2. ABO blood grouping : Co-dominance
3. XO type sex determination: Grasshopper
4. T.H. Morgan : Linkage

Which of the following characteristics represent 'Inheritance of blood groups' in humans?

1. B, C and E only
2. A, B and C only
3. B, D and E only
4. A, C and E only

A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

1. only daughters
2. only sons
3. only grandchildren
4. both sons and daughters

Select the correct statement :

1. Franklin Stahl coined the term “linkage”.
2. Punnett square was developed by a British scientist.
3. Spliceosomes take part in translation.
4. Transduction was discovered by S. Altman.

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

1. Both are due to a qualitative defect in globin chain synthesis
2. Thalassemia is due to less synthesis of globin molecules
3. Sickle cell anemia is due to a quantitative problem of globin molecules
4. Both are due to a quantitative defect in globin chain synthesis