Genetics and Inheritance
Questions covering genetic linkage, mutations, chromosomal abnormalities, and inheritance patterns
Questions
In which of the following crosses will the progenies obtained be fifty percent homozygous recessive and fifty percent heterozygous?
- TT x Tt
- Tt x Tt
- Tt x tt
- TT x tt
Which of the following chromosome numbers is present in a trisomic individual?
- 2n + 1
- 2n - 1
- 2n - 2
- 2n + 2
Loss of one chromosome from one set is called
- tetrasomy
- nullisomy
- monosomy
- trisomy
The addition or deletion of one or more chromosomes in a set is called
- euploidy
- aneuploidy
- polyploidy
- heteroploidy
If a couple of medium height has three tall-statured children, then what could be the possible explanation for it?
- Dominant genes
- Cumulative genes
- Codominant genes
- Sex-linked genes
- None of the above
Which of the following test-cross ratios indicates linkage?
- 1 : 1
- 1 : 2 : 1
- 9 : 3 : 3 : 1
- 7 : 1 : 1 : 7
The type of gene mutation in which a purine gets replaced by a pyrimidine and vice-versa is called
- transduction
- translation
- inversion
- transversion
Coupling and repulsion are the two aspects of a single phenomenon called
- crossing-over
- linkage
- synapsis
- terminalization
Which of the following types of mutation is a reversible mutation?
- Point mutation
- Back mutation
- Forward mutation
- Lethal mutation
If a segment of a chromosome is broken and attached to the same chromosome upside down with no loss or gain of genes, then the aberration will be termed as
- deletion
- duplication
- translocation
- inversion
If the father is a haemophilic and the mother is a carrier, then what are the chances of their son being haemophilic?
- 0%
- 50%
- 75%
- 100%