Principles of Inheritance and Variation questions
1199 published questions with worked solutions.
- A diseased man marries a normal woman. They get three daughter and five sons. All the daughter were diseased and sons were...
- There are three genes a, b and c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What...
- Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother...
- The linkage map of X-chromosome of fruitfly has 66 units, with yellow body gene (y) at one end and bobbed hair (b) gene at the...
- Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross, is...
- The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes : -
- Which one of the following traits of garden pea studied by Mendel was a recessive feature : -
- Which one of the following conditions though harmful in itself, is also a potential saviour from a mosquito borne infectious...
- Pattern baldness, moustaches and beard in human males are examples of : -
- When a cluster of genes show linkage behaviour they : -
- In Drosophila, the sex is determined by : -
- Genetic Map is one that : -
- A normal woman, whose father was colour-blind is married to a normal man. The sons would be :-
- The recessive genes located on X-chromosomes in humans are always -
- Crossing over that results in genetic recombination in higher organisms occurs between :-
- In a mutational event, when adenine is replaced by guanine, it is a case of -
- A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his...
- A self-fertilizing trihybrid plant forms :-
- Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to :-
- In a plant red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt...
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